Cramps after intercourse?

Jordin • Mummy to a beautiful girly, Pregnant #2 Due 21/6/2015
Am 5 weeks this is baby number #2 had sexual intercourse and I had cramping after like ASIF my period was about to start... I remember cramping after sex with my first but I can not remember the weeks... Now I know you can not have a misscariage from sex.. But just wanted so reassurance I've looked on Internet and it's says it's normal.... Still worried :(