But a counteracting force is that some couples think 9 months ahead and are afraid of delivering their baby in a COVID-overloaded hospital.
COVID makes the opportunities for conception easier but adds to the stress and uncertainties of delivery and postnatal care. (So maybe more sex activity but also more contraception to prevent pregnancies.)
It's like that anecdote I heard of the forced shelter-at-home lets people do home-improvement projects but some are afraid of getting on high ladders because if they fall and seriously injure themselves, they are afraid the busy hospital won't be able to see them quickly. COVID changes the risk profile even for people who don't get COVID.