Answer in relative terms: Yes they did. Relatively speaking, there is that which is "nothing", and there is that which is "something". In relativity, and to validate the concept of causality, there must be the existence of that which in one way or the other affects an observed event so that empirically measurable values of the event are detected as to change. Whatever change is detected, there must be an observed quantity of that which has the quality of causing that particular change. If anything at all happens, we must relate this happening to an actor of a particular action. The question in empirical investigation is then to establish a causal link between the observed effect and what caused it. The truth of a suggested causal relation is based on regularity and predictive value. So from a relative and scientific perspective, since there is obviously that which is something empirically real and observed as to be in constant change/flux, there must also be that which caused it to be so. Relativity can map cosmological evolution back to the electroweak epoch, but no further. The suggested "Grand Unification Epoch", coming before the electroweak, is still to be understood. Unification implies a situation where relativity is not all there is. There might also be a quality of absolute-ness and discrete-ness. That brings us to the complemetary answer.
Answer in absolute terms: No they did not. Absolutely speaking, there are no "fluctuations" in a moment of singularity. If it fluctuates, it is a single fluctuation. If not, we are assuming a scenarion of many initial states, not an initial state. Further, the concept of "nothing" as opposed to "something" is nonsensical least we agree upon what is required for the quality of detection. This is to ask; what is it with a hypothetical quantum/unit that makes it real in the empirical sense? Could there be a unit S which is true in the ontological sense of actually being S, but also being empirically unobservable, and in that sense "unreal"? Could there be that which only can be analysed based on an imaginary value, and that evolves in such a way as to translate the imaginary base value into an inceasingly real value?
This is important to contemplate, as is done in math's complex analysis, because in absolute terms; there is no possible relation of nothing vs. something for the simple reason of "nothing" being absolutely impossible. It defies reason and logic to assume there is the existence of that which is defined as non-existence. It is to say that existence includes non-existence, and we create conceptual uncertainty "out of nothing".
An alternative question could be:
Does the quality of fluctuating cause the effect of a quantity being of variable empirical value(s)?
To phrase the question thus is an effort to stress the importance of quality in the analysis of any quantity. It is to say quantum theory might lack a definite sense of quality. A quantum of reality is a statement of ontology. It is to say: there is that which is, and we can assign this fact a nominal value e.g. Unity, One, Singularity, initial state, God, i1,r0. The point is, a nominal value can be true while not being of any empirically observable, and thus analytical, value. As we all know, the imaginary part of complex analysis is related to rotation. Rotation/spin is not related to the quantum actor as such, but to its quality of action. It is a quantum of quality, and that quality is acting as rotation.
I suggest that the action of rotation can cause the effect of translating a quntum of this action as to project angular eccentricity perpendicular to bidirectional compression of its rotational axis. By this, it is not unreasonable to assume the quality of the quantum will generate/produce the emergence of empirically real values from av base value of a sphere/ball with imaginary axis equal to diameter i.e. symmetric. The nothingness of the base symmetry is then of empirical values, not ontological. With flattening of the quantum, empirical values of space/eccentricity will increase in magnitude all the way to full transformation at moment of 2D Surface. The discrete value, now an empirical value, might then be be opposite the initial and imaginary 1. Axis turned out,by rotation, to be horizon would be imaginary 0 = real 1.
Then we have turned eternity of zero space into a neverland of infinity.
Eternity is nowhere
Infinity is never
All of empirical values as being "real" are likely to be observed as continuously fluctuating between two extreme discretes, assumed here to be possible only in the special case of singular action.
Ergo: The fundamental and thus unconditioned force of rotation caused a singular and uniform compression and eccentricity of an initial quantum, equal to an initial quality. Thereby, energy as kinetic and potential, is fundamentally equal and uniform, and in the singular case not the cause of change. The cause is force of rotation. The effect is that eccentricity is compressed as compression is eccentric. Further, empirical values to be observed at all requires a real observer which is, at the moment of observation, of values not the same as the values to be observed. This makes singularity unobservable, even if it is of empirical value, except for when being in the moment of perfect 3D symmetry. At that, it is void of any values but imaginary/axial "time".
What also requires a real observer is gravitation. A singular body can implode vertically as it explodes horizontally, but cannot attract anybody but itself. When it does, it also rejects itself.
Thus, gravity is not a fundamental cause but a relative effect in a many body context.
To make scientific sense of the above, we must analyse a parity of such events. I suggest this dual space generates values of electromagnetism. Assumed to be liquid-like, the values of quanta will locate and relocate as it is forced to flow in vortex-like nodes acting as either "well" or "drain".
The lack of references is because I try to offer an alternative model/perspective, not to add complexity to the ones we already have. It is I who suggest there is only one fundamental force i.e. rotation, that there is no fundamental energy and why any initial state singularity must be known by having faith in our imagery. Abstractions in math and teology can handle the singular action. Empirical science can not. Symmetry is of zero empirical value.
My One Cent