I am 40 yrs old. I had a tubal ligation done in 1999 during the c-section birth of my youngest child. my husband and i have had unprotected sex since then with no issues till lately. My last period was only for 4 days( usually lasts 6-7 days) and i am experiencing nausea and food cravings. also the smells of some foods makes me want to hurl. is it possible that i could be pregnant?