Precum and peeing ??????

From what I’ve read, precum makes a penis’s environment more basic so sperm can travel up more easily. Precum doesn’t contain any sperm, but there can be sperm left after ejaculation, and precum can pick up leftover sperm as a guy gets aroused and hard.

I’ve also read that since pee makes the penis develop a more acidic environment, it should clean out most of the leftover sperm. That’s why a guy should always pee before sex IF the pull out method is used.

Is peeing before a myth or a fact? I’m only asking because (don’t judge this wasn’t supposed to happen) my boyfriend and I were in the car, and I guess long story short, he stuck it in me just once, and i grinded on him (no penetration) without clothes as a barrier. He peed multiple times that day and did not masturbate/cum either.

My period is irregular, but I’m also on day 39, which is odd, since most of my periods range from 35-38 days. I’m getting cramps, sore breasts, and I’m kind of emotional. Super stressed, just came back from another country after two months in July.

Thank y’all for the advice :)

To clarify: I grinded on him without penetration, but we weren’t clothed. Then he stuck it in me once, and I told him to stop because he didn’t have a condom.