Round ligament pains??

I've heard a lot of different women describe what they feel like to them and with my first pregnancy it was just like period cramps. But at 18wks now only at night I lay in bed and if feels like I haven't peed in days and it's sooooo uncomfortable it makes my whole stomach hurt. I go pee and it's not even a lot of pee. Sorry tmi. Also I've had bladder/UTI/kidney infections and it's not like that weird can't pee pressure feeling either. Anyone else having this happen?