As long as your not bleeding its most likely just round ligament pain.. your ligaments stretching yo fit the baby.. you can take tylenol and a warm heating pad to help the pain
Make sure ur drinking plenty of water too it should help
If your dehydrated it can make cramping horrible. Also an untreated uti can do that as well. Call ur dr just in case because untreated uti can cause preterm labor/miscarriage if it gets too out of hand. Good luck.
Drink lots of water, take a warm bath, and lay down.