I had sex w/ my bf and we used a condom. It has been 35 days (which for me is about normal) since my last period. I feel little cramps should I worry?

No ... I don't think you need to worry. When used correctly, condoms are really quite effective at preventing pregnancy. You really haven't missed a period yet, since you know you have a long cycle. Wait for about a week after the day you really expect your period and do a pregnancy test. I predict your period will come before that is necessary. Best wishes:)