First bloke, I waited over a month of him love bombing me, he stopped talking to me the next day, and was with someone else within a week.
Second bloke, waited over a month, he too was abusive.
Seemed waiting did not help me weed them out.
First date with DH, we did it. Although we had met in the week before, and I just spent most of it finding ways of taking my mind off doing it. We have been together nearly 30 years now, married for over 20. But I didnt sleep with him expecting this future, I wanted to, he wanted to, so we did. And whilst the sex didnt result in my orgasm, I dont orgasm from sex alone, he had already helped earlier in the night.
So to answer the OP, do it when it feels right for you. There is no rule, and what works for one couple may not work for another.