Pregnant or just paranoid?

In April I took Birth Control Pills for a month, I didn't miss any pills, this was the only time I took these pills. I had unprotected sex on May 21st, I think my boyfriend used the pull-out method which I know doesn't work in all cases. Ever since that day, I've been stressing out so much because I can't stop thinking that I might be pregnant. I have not experienced "morning sickness". I've always been very thin because I have a really high metabolism, I am 5'6 and weight 105pounds. The only time I feel like I'm pregnant is when I stare at my stomach, I do not know If I am bloated or actually pregnant, which worries me a lot. I am also anemic, if that has anything to do with all this. When I wake up in the morning my stomach doesn't look full, later on when I eat my stomach looks bigger. After I finish eating, my stomach feels very full no matter how much I eat. Right under my belly and between my hips is where my stomach looks full most of the time. I talked to my mom about this at first which was not easy at all, she said I can't be pregnant since I've been getting my periods yet I'm still worrying. That very same month, April, that I took the Birth Control Pills, I also took some Iron pills that my doctor prescribed me due to the fact that I have Anemia, she said I was two points away from getting a blood transfusion. I was also taking One A Day Woman Petite, which at first I thought was the cause for all this because It made me eat more than usual and made my stomach burn so I decided to stop taking them and the burning did stop after I stopped taking them. And my stomach has also been growling a lot as well. I usually don't ever get too heavy or too light periods, they are in between and I always get really bad cramps. I got my period three times after I had unprotected sex, the first period was as usual, the second period was a bit heavy, the third one has actually been light and I think my cramps have lasted longer than usual. My periods usually last around 7 days. And by the way, that was also my first and only time having sex. I'm sorry If this is too much, I just tried to provide as much information as possible.