Can you ovulate and not get a period? Am i pregnant? Help?

Hi. Me and my boyfriend have been ttc for 3 months now. I got my last period february 21st. My cycles are usually between 28 and 34 days. Im pretty sure i ovulated in the month of march because march 9th 10th and 11th i got cramps. Me and my boyfriend had march 2nd 5th 11th 18th and we took a long break and didnt have till the 31st of march. I was suppose to get my period again march 21st. Im pretty sure i ovulated in march. So wheres my march period? Can you ovulate in march and not get a period? Is it pregnancy? I took 3 pregnancy test one 3 days before my period. 6 days late and 10 days late. They were all negative. But with february having 28 days in it and march having 31 the days would be all screwed up. Now its been 6 weeks and 3 days without a period but no positive test. I am having white non stretchy. Kinda lotion like cervical mucous. Am i ovulating? Wouldnt that mean im not pregnant or is it a pregnancy sign? I also have been having cramps. Headaches. I feel nauseated when im hungry. What could be going on with me? I have a doctors appointment next wednsday april 13th. But its driving me crazy. Thanks for your help.