Re: I had sex for the first time and scared that I'm going to be pregnant.?
since you took the morning after pill Id say youre pretty safe.
this should be a lesson to you to be a little more careful, condoms are very safe, but not 100% safe, and reusing them is going to make them less safe. If you're going to get this upset everytime maybe try doubling up? like taking the pill and using a condom, this is a VERY safe method. (just remember some things can make the pill less effective, like antibiotics).
Cramping can sometimes happen, maybe he pushed to hard, maybe you weren't "warmed up" enough. if the cramping occurs every time you might want to see a doctor about it to make sure that it's nothing more serious.