My last positive OPK was on January 24th, 2011. I had a period from taking prometrium from 01/09/12 to 01/13/12. I took a pregnancy test on 01/17/12. My question is, it is possible that I could be pregnant from my previous cycle? I would have been, (assuming that I DID ovulate) 24 dpo when I last took a test and got a BFN.