could i be pregnant again?

so i started a new birth contol and i had sex and im still not having my period. its been all messed up with changing to a new one but i should have had it by now i think. heres the run down:

June 25-started period

June 28-started new birth control

July 11-had sex

July 13-still bleeding

July 22-supposed to start according to the birth control but didnt

August 2-started period? sometime inbetween the 22 and the 19th i had a bleeding session. i forgot to take a pill on the 2nd, taking it the next morning of course and then again in teh afternoon like the package says but i managed to bleed for about 5-7 days arounnd this time.

August 19-supposed to start but once again didnt

august 23 -i was supposed to start my next month but i decided not to to try this over agian and make sure im not pregnant and i still have not got my period

am i just being paranoid? i would be way too emabrrased to buy a pregnancy test so im trying to get some gauge on what other people might think to boost my confidence either way. thanks for the help.