wondering if I'm really likely to be pregnant?

Hello I had an abortion last year, I conceived the day my period stopped on the 1st of Jan 2011 which is rare I think, lately I have been having unprotected sex nearly all this month, I came off on the 6th and started on the 2nd of march, after that I have been having unprotected nearly every other day, lately I've been having to pre often, I have bright blue veins really showable on my breasts and my nipples are tender, I have had abdominal pains and been feeling ill sometimes during the day and normally in the morning. I have also had a lot of constipation and then its really soft sometimes...I was just wondering if I'm really likely to be pregnant seeming as I got pregnant one day after I got off my period last time?....