I wouldnt worry, me and my partner havnt stopped sex at all, its just slowed down alot as i sleep alot more haha! But i did all through last pregnancy too and never had anything to worry about, if you actually have the energy for it then do it!
I had light spotting last week after sex and I'm also very nervous about doing it again. I'm around 6 weeks so going to wait til doc appointment in 2 weeks time before trying again. Good luck!
Just got back from our first prenatal visit I'll be 6 weeks on Friday. The doc said that sex was fine, light spotting can happen. She said that if spotting does happen to wait a week before having sex, if it happens again to wait until the first trimester is over before trying again. I hope this helps!