Feeling worried after sex at 18weeks Pregnant

So I’m a bit emotional here thinking I could have hurt the baby after having an O... we did missionary and it had been sometime since I actually felt pleasure from sex.. I feel like I hurt the baby whose gender we find out next week and just thinking bout the lOoong wait it was and to have done something wrong is worrying me. I know (from posts) that baby doesn’t get hurt but I can’t help thinking/feeling guilty for having sex. I need some reassurance 😣