am i pregnant??

i have been feeling off lately and i am wondering if i could be pregnant? i am on the pill although i sometimes take it later or or forget and take it the next morning. i have sex w out a condom, but pull out and have it on my stomach instead. my period isn't due for another week and a half, but i have had bleeding that is dark and sticky for four days, and i am also breaking out into small zits. i can't easily get a pregnancy test so i would rather wait and have that be my last option. thoughts??