AF LATE....

Af is 5 days late I've never been more than 2 days late and my period is always regular. I also took two pregnancy test (the cheap kind) during the evening and they both were negative. Last month I was on famera but couldn't get an iui because I didn't ovulate on the left side (right tube is currently blocked)..... The doctor told me I could continue to try naturally since I was taking the famera I have no clue what's going on... Any advice?