I stopped taking bc in March. Had short/light period 4/7 and then on 5/8. Pretty sure I ovulated on 5/22 (sharp pain in right ovary but did not test to see). I had unprotected sex 5/20 and 5/23. Figured I should get my period this Sunday but it never came. Took pregnancy test today but negative. Could I be pregnant and it's just not showing up yet?