Should I get checked out?

Ja

So I have been cramping on & off today, no bleeding or spotting...but I didn’t have this with my first pregnancy that I can remember...I am only 5 1/2 weeks, haven’t had an ultrasound yet...should I get checked out?? My friend who just had a baby said it could just be because my husband & I had sex last night, so that could be why the cramping is different...suggestions?