Cramping

Taryn
I am in my first few weeks of pregnancy and I am having slight cramping, nothing like period cramps but it's weird. A sometime I'll have cramping on one side and sometimes the other. 
   My sister in law said she only ever had cramping on one side. Has anyone else experienced this? If you did, did you end up having twins or is it a normal thing
There's a history of twins in both my husband and my family and we're really hoping for a set. 
I'm just really curious because this is my first pregnancy and idk if this is abnormal or not!
Advice will be much appreciated :)