Pregnant !?

I’m just wondering if I may be pregnant or not! So I started taking the birth control pill Sprintec on March 8th and they were making me sick so I stopped taking them on March 13th. I missed a week and few days of taking them, and then started back taking them on March 23rd. I took my pill 3 hours late March 25th and me and my boyfriend had sex and he ejaculated inside of me. That night was the day after I had ovulated and I quit taking the pills completely after that night also. I ended up getting a period around April 8th and that lasted for a few days, which was kinda weird because I had just had a period around the 19th of March. I got a really BAD cold around March 30th that lasted for a week and I was throwing up non stop and had major headaches and couldn’t keep food down.. I haven’t felt many symptoms just a little fatigue and EXHAUSTED, I feel heavy and out of breath at times, I’m having constant lower back pains, I’ve gained 4 pounds, I’m eating like crazy, and urinating A LOT.. I took a pregnancy test yesterday (April 27th) and it came out negative. It’s been a month since me and my boyfriend had sex and I haven’t had a period yet and it was supposed to show days ago. What could be going on!?

PSA - WE ARE TRYING TO CONCEIVE!!