my husband had a vasectomy reversal in early December. we were allowed to start trying Dec 29th. have tracked ovulation and had sex everyday that I was fertile and on ovulation days. had a period for January but started one day early. for the last 2 days I have been very sick, haven't been able to eat, very nauseous, having really bad belly and back cramps and have been sooo tired. used one of the .88 Wal-Mart tests and got BFN. I feel pregnant but test says negative.