Well, i'm not going to give you the nicest answer. This happened to my father. He didn't want his wife (my stepmom) to have another baby, because my little sister was very young and he thought that they had their hands full as it was, so he wanted to wait, but she wanted a baby so she stopped her bc behind his back, and it wasn't very pretty.
What you're doing is selfish, and very stupid, a baby should be a mutual decision, and pressuring him to be a father before he's ready is a big mistake.
As for the pre-ejaculate, my mother got pregnant with it and many women get pregnant with it.
I still recommend that you let your guy know what's going on, because you and the baby are more than likely going to get hurt. You should put yourself in his shoes and reverse the roles for once.

Ok, I don't know if you guys saw my other replys to this same post on the other forums. But I did talk to my finace, and weve decided to start trying after he gets back from his trip is pretty much what it comes down to
thanks for your reply..Not replies lol

I'm really glad that you decided to talk to him, it'll be so much easier on him. It's good that you'll be off the pill for several months before you conceive. That's what my mom did before she had me (the Dr. Told her that there were some risks, but then again, that was 20 years ago).

Best of luck to you and your guy, I hope that you take your relationship seriously and make that true commitment, marriage should be like having a baby, a decision made for life.