I found out at 11.5 weeks with Lily. I had what i thought was AF but was breakthrough bleeding and because i have PCOS and my cycles were anywhere between 14 and 49 days I didn't think too much when AF didn't come again. But I also has m/s from about weeks 5 to 15. I seriously thought I was just ill, the thought of pregnancy never occured to me until my mum asked if I was(mother instinct i spose) and I just broke down crying and said I don't know! I was 17 at the time.