How to birth a child as a male

i was just about to comment that

It takes Almost 72 hours am I right?

But what if you took the potion continuously until you were actually impregnated?

I think you'd still be turned back before the next potion took effect, maybe just for a second, but in that second you became a man and therefore the sperm couldn't do its job and you'd have to redo the whole process and then keep failing. I could be wrong though, I don't know much about Harry Potter.