Intercourse while pregnant

Last night for the first time in 5 months, my SO and I had sex, but ever since then I haven't felt the baby move. Can something be wrong ? The doctor never mentioned anything to me about not having sex, I was only told I was high due to my iron/anemia. Is baby okay ? I haven't had bleeding or any pains, just haven't felt him since yesterday. I'm 20 weeks pregnant is this normal ? 
-FTM