This is an mRNA virus. The mRNA needs to enter your cell via a vector of some sort.

The mRNA then needs to be transcribed into protein.

That protein then needs to be released into the blood stream for your immune cells to create antibodies for it.

There is natural degradation of mRNA over time, and there are enzymes located in cells to extend the life of mRNA as well.

So with nearly inert cells like quiescent ovum, does the mRNA stay there longer or doesn't degrade at all? And if so, does it compromise the ovum / egg from being able to be fertile as some proteins and energy is being used for making viral particles?

My major concern is that the cells generally excude these viral particles after they break, could ovum / eggs infected with these subsequently burst and die over time... and if so which ones would be more vulnerable.

See, the difference between men and women is that men's sperm come from progenitors.

Women's eggs are all there before they are adolescents.

So technically, all the eggs that a women will ever have could be potentially compromised whereas a man will make more sperm and should not be compromised.

I think that this will affect fertility, not so much as the anti placental antibody that pfizer was worried about.