soooo confused

Mikasa

So here's my situation, my husband and I have been trying to conceive for the past 4 years because I wasn't ovulating like I should oh and my period literally stopped coming on when we got together. After 2 mos of missing my period I automatically thought I was pregnant, we went to the doctor and found out a couple days later that I wasn't ovulating 😔. Anyways fast forward to January 2018 I'm on birth control pills and my period started coming on like clockwork, so in April I stopped taking my bc pills and my cycle came on naturally the following months 😌. According to glow and my cycle I was supposed to ovulate on the 9th and came on my period the 24th of this month, but I went to the e.r on the 19th and had a pregnancy test because I needed to have a ct scan, my test was negative...could it be that my hcg levels were too low? or...is my cycle off again? someone help me