Well at least your moms will be glad you were honest with her. If you're not preggy, I think you should sit down with her and let her know that your sexually active. Not only can she help you with getting birth control, she can talk to you about .S.T.D's. Birth control prevents birth, not .A.I.D.S. Ya know??
If you're not ready, than I suggest you use condoms. If the guy your having sex with doesn't like it, that means he's prob. Been with who knows how many other girls without protection.
Good .Luck and I hope you get the results you want!!
Sarah