Weird period...very someone answer me!?

ok, i has loestrin bc and it made me bleed for about a month, my doctor just recently gave me a new bc called yaz.. now i had my regular period (b4 the loestrin pill) dec 17-21, that sunday dec. 21 i took the first bc loestrin pill ever. I later then began breakthrough dec.28 and didn't stop bleeding until jan. 5....my monthly calender says im suppose to get my period jan.26, now, I've been on the new bc, YAZ since jan.18th which makes it for about a week and a half... is something wrong?? and yes i have had within some of those times, pls, someone.. help