Ill be 33 weeks tomorrow and Ive been having cramps lately..I never had contractions in the stomach with my twins I had back labor horribly..do you know what could be causin these cramps?

It depends on what the cramps feel like and where they are at. They could just be Braxton Hicks which would be normal at this point.
However, if they are rythmic and continue in a pattern for awhile then they could be the real thing.
If they feel like menstrual cramps and especially if they are accompanied by any bloddy discharge or decreased fetal movement then you need to contact your doctor immediately.

Are you drinking enough water? Sometimes you can get cramps if your fluids are low. That happend to me with Kaylee. If it continues call your dr.

I would say too that it could be the baby on your colon or something. Tyler would sit on my colon and I felt like I was going to double over.

I have cramps often and have to drink a LOT of water and move onto one side and switch positions until they stop. They are very painful. From what I have heard they are contractions or BH so I just count the "waves" and if I have more than 7 in an hour, I call the dr. I will be 33 weeks in 2 days.