It's unlikely you'd be feeling movement early in pregnancy. Although, some people can feel their uterus growing early in pregnancy (they tend to be really sensitive to their bodies). I didn't feel movement until 18 weeks, but did feel my uterus stretching at about 12 weeks or so. You'd have to be pretty far along to feel movement. I'm telling you this to try to ease some anxiety. If you have had unprotected sex, it's possible you're pregnant. But it's not common to be far enough along to feel movement without knowing. In either case, definitely take a home pregnancy test. The cheap ones are just as effective as the expensive ones. So, just go to the dollar store, buy a couple, and take them. They rarely give false positives, though false negatives are possible (hence why I recommend taking more than one).

As far as the stalker goes, report him immediately. For your safety.