I'm glad that you're going to keep the baby if you are pregnant.
It sounds like you have a very good chance of being pregnant, but of course you can't find out for sure until you take the test. (It's worth the money to know either way!

)
If you are pregnant than just tell your boyfriend the truth. There are different ways to tell him if you're afraid to tell him face-to-face (ie a card or something), but don't EVER let him talk you into getting an abortion!
And if he pulls that "get rid of the baby or I'm leaving" card, don't fall for it. If he really does leave you over that, he would have left eventually anyways.
So get the test and let us know how everything turns out!

Good luck hun!