Had a baby in aug., depo shot in nov, messed up cycles likelihood of being pregnant?

Ok so before I became pregnant I had a VERY regular cycle of 33 days exactly. I had my daughter last August which of course screwed up my whole schedule and I was basically having a light period for months. In November 2009 I took the depo shot which of course wore off in the very beginning of February 2010. My fiance is in the air force and I flew out to see him last weekend and we had unprotected sex a lot. Every time he pulled out except once! Which was early morning on Sunday. Now I'm quite confused since my cycle is all messed up and I'm just wondering what would be the likelihood of being pregnant again?
I'm sorry I forgot to add that my 6 month period finally ended on February 6th 2010 and then I got it again March 11th 2010, it stopped for a day on the 20th then started up again and ended last night. I'm not so sure about ovulation tests.
 
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