Last night DH and I got a little overly frisky. LOL
I think you're okay. You seem to have done some research already, so you know it's pretty common. If it happens after sex, you know what's triggering it. As long as it stops fairly quickly, it shouldn't hurt anything. If you're nervous, call your doctor. It won't hurt anything to call and you might feel reassured. It happened in my first pregnancy, but just in really early pregnancy. I've heard others say it happens the whole time.