I've been off depo for a month took the because pills for a week and stopped because they made me ill, I had a period during the 7 days after I stopped that was on 24/10/12 I looked it up on my pregnancy app and I was supposed to ovulate the 3-8th of November had sex right the way through the ovulation period and now I'm due on the 22nd but having strange symptoms, is there a chance I could be pregnant?