perfectly normal to have ligment pains on just one side
Probably from the ovary you dropped your egg from (typically there is a small cyst there). Round ligament pain typically (not always) doesn't show this early...or it could be a version of cramping. If you're doubling over, call your ob...good luck!
I'm not positive if its normal but, I get it on one side sometimes and I saw my baby last week with a heartbeat if that helps at all.