Cramps, stretching and in between!

I'm 12 weeks today and for the past 2 or 3 days I've had very light cramping and I've been getting what feels like round ligament pain, it's literally up the sides of my belly, it tightens up and then goes away. But it's scaring me a little because this is my first pregnancy and I obviously never had it before. I had cramping in the beginning from week 6 to weeks 10 but I'm a little concerned that it's coming back. Can anyone shed some light?