It is possible that your hormone levels have been a little messed up though, and the pill can sometimes mimic pregnancy symptoms, especially nausea and breast tenderness.
My own personal experience-
i was on birth control pills from the time I was 17, and was like clockwork with them. I stayed on them even when I was single (3 years!)
i used to sometimes skip the inactive ones, and go straight through months without having any periods. I had no problems with doing this.
When I fell pregnant, it was the last thing I expected. In fact, I actually thought perhaps i'd been on the pill too long, and had become completely infertile, or that I was dying of cancer when my periods stopped.
I had no other symptoms of pregnancy at all.
So anything's possible !! I guess i've been no help at all :roll: