I thought I was pregnant but my period came on

I’ve been TTC for almost a month now and my boyfriend and I had unprotected sex in April. I knew I was going to ovulate somewhere around the 15th so we had sex on the 8th, 10th, && 16th. Each time we had sex, he ejaculated inside of me without pulling out . About a week later I began to have really bad headaches, nausea, fatigue, cramps, and tender breast. As the 2nd week approaches the symptoms began to get worse but the cramping was slight. My period was due on April 29th and I had no signs of bleeding. After 2 days of being late I noticed that when I wiped there would be pinkish and brown stuff on my tissue and it wasn’t much . Today it’s a little heavier and it’s actual blood so I’m guessing it’s my period. I really thought I would be pregnant but then my period comes on . Is there a chance I could actually be pregnant?