Taken planb 3x's in 5weeks. each time i got a period. during my last period we did not use protection or planb. could i get pregnant inspite of period?

Possibly: Your regular cycles were disrupted by the repeated hormonal treatment, so it is possible you did ovulate and could now be pregnant. More importantly, it's a good idea to be responsible about sex & not use Plan B as a regular contraceptive. You & your bf should be more proactive in preventing unwanted pregnancy. See http://www.Cdc.Gov/reproductivehealth/unintendedpregnancy/contraception.Htm.