Uncomfortable feeling after sex

So I’m about 5 weeks pregnant and no complications so far, no pain nothing.

Today I had sex with my boyfriend and everything went fine too, no bleeding but about 20 mins later I started feeling a strange pulling feeling can’t quite describe it. Definitely not real cramps maybe small ones and now I’m obviously worried… should we not have? I looked it up… and read there was no danger even in the first trimester.. but now I’m a tad bit worried. No bleeding, just a bit of a uncomfortable feeling/pull.

Will baby be alright?