Does Utovlan Taken To Delay Periods Affect Ovulation?

Hi there. I was prescibed Utovlan to delay a period last month. When I stopped it I had my period as normal. We are trying for a baby and my doctor told me to use protection the month I was taking the tablets as no proof on harm to unborn baby. However, I track my cycles quite closely using a fertility monitor and found I din't ovulate on my usual day 14. It went to high fertility on Day 14, then stopped asking me for the sticks on day 16 so I don't know if I ovulated or not! Would these tablets interfere with ovulation once out of my system? I am due on today and have taken a PG test but negative. Help!