I was in a similar position but was 22. Me and DP been together four years when I found out I was pregnant in July. Was going into my third year of uni, and I knew my parents would disapprove.
The best thing I can say is you and your boyfriend tell your parents together. Make it clear you want to keep the baby, if you do, and you are going to do it together. My mum was fuming, said she would never talk to me again. I think it took her three months to ring me, but then she was 100% supportive and loves her grand-daughter. They will change and if they don't, more fool them. Don't let anyone pressure you into doing anything you don't want. Tell them face to face if you can, it took me 3 hours though!
I would also email your college and ask if they make special provisions for pregnant students/with children. It happens more often than you think. If you want to live together (I can't remember whether you said you are sorry) then put an application in to your council for housing. This will be on their website, or you can phone up. Do this ASAP as waiting lists are long.
There's been lots of good advice about foods, vitamins etc, just phone your doctor to make an appointment.
It will be hard doing college, but you will get through it. I intend going back to do my third year in September because I will get special grants for childcare. You will feel better the example you are setting for your child and not 'resentful' if that makes sense.
With the cramping, totally normal I freaked out about it until 12 weeks though. Only if your bleeding with it is it a worry. Even then, it might not be anything to worry about.
Best of luck and congratulations. Your boyfriend sounds lovely for sticking by you. This is a great board, I miss it now! Everything you think of, someone has asked the question so I didn't feel so stupid!