Complicated situation, I had intercourse, now I have cramps in my stomach

Please don't judge me :( I'm 15 had sex New Year's Eve of 2014. Prior to that for 2 weeks was taking birth control. But at different times . One day I would take it at 6:00 or the next day 6:18, I thought since it was still in the 6:00 range it was fine . Anyways I missed a day on the pill and I haven't took it in 3 days . Anyways New Year's Eve had sex without protection he pulled out .then he came I was taking birth control to help regulate my periods. Ever since the sex then I've had these tingling sensations and cramps . In my pelvis and stomach. It was my first time . And he was all the way in . I didn't bleed or anything . Technically I wasn't a virgin I popped my own hymen with a dildo a year ago . But it was the first time i been with a boy didn't hurt at all I didn't bleed. I have a doctors appointment next Thursday . With my doctor Jennifer . She always ask am I sexually active and I lie . Should I tell her the truth . Can they test me for pregnancy will they have to tell my mom if I am pregnant :( The guy I had sex with is 21 hes my brothers friend known him since I was 8 . It's a long story how we got involved with each other . And there is a chance I might never see him again :( I don't know what to do . I'm scared . And on top of that I have a boyfriend I cheated on him :( only person I told is my sister who is 19 who also previously messed around with my brothers friend when she was my age :( my mom knows about it and still let him back in the house after 3 years . He's a family friend like a son to her Now she kicked him out again because my moms boyfriend caught him in my room . Like standing in the doorway . I lied and said we wasn't doing nothing . And she said he couldn't come back anymore . He just lives like a 5 minute walk away from me . But he's leaving to this place called job core on the 7th of this month and won't be back till summer he has no phone :( I have no way to contact him . I added him on facebook but he probably won't be able to check it untill he goes back to job core . Last night I went out walking looking for him I couldn't find him . I can't stop thinking about him . And then I have to deal with the guilt of cheating on my boyfriend . And I don't know if I should tell him . I can't even act normal around him because I'm thinking about another guy. Last year my current boyfriend cheated on me . But I know it doesn't make it right what I did. Only person I told is my sister . Who will soon be my legal guardian because my mom has colon cancer . And is dying . My life is just screwed. I know this is a lot but it's the truth I swear I'm not a troll . Please help me . I guess I was with him because I liked the attention I loved it when he touched me . My boyfriend who is 20 we are in a long distance relationship . He's supposed to come see me this December . But if I'm pregnant our relationship is over I love him I been with him 2 years . If I am pregnant I'm gonna step up too the responsibility. I know I'll be a good mom I know how to take care of babies I have a lot of experience . I turn 16 October 15th of this year . I can't get a job till then . I'm sad because I just wanna see him one last time . I know he has other girls . And he probably used me . But idc the way he made me feel the affection I loved it :( according to the birthday control pills . I'm due for my period next week . Blue pills I don't bleed green pills I do bleed but I haven't been taking them .