Help Really Late period could I be???

Hi I was supposed to have my period today August 6th but it is late. The last time I had my period was June 16. I did not have a period in July. I am pretty irregular. Once my af went for 3 months and my af goes to different weeks sometimes. Sometimes even miss weeks. That's how irregular I am. Me and my SO have not been trying to get pregnant. We use pull out method. I'm supposed to be on the pill but haven't took it in a while. I have noticed that I been having more back pain then normal, I have large breast so back pain is normal. When I'm home I'm always going to pee like it goes through me. But when I'm at work I only go maybe 3 times. Few nights ago my nipples were a little sore. Heartburn is normal for me. Always have mood swings. I had Pizza last night and I usually love papa John's Pizza but late night it about made me sick. I have anxiety and stress alot so not sure if I'm pregnant or what? Any help? Advise?