There could be a possibility that I am stressed, but this has never happened to me before

I have no clue if I am pregnant or not and I need someone's help so I can put my mind at ease. My boyfriend and I use a condom every single time, but last month he entered me a couple times just to feel what it was like. We made extra sure there was nothing on his ... And he did not ejaculate before. I have no had my period yet this month and my last one was January 17. I use a period app to keep up and it's usually almost always correct. I was supposed to have it on the 13th. I have been feeling very bloated and my abdomen looks like it just keeps getting bigger. It'll get big and then sink back down to normal size throughout the day. There could be a possibility that I am stressed, but this has never happened to me before. I am 15. I'm not on birth control or anything. Also I have not been exercising and I have been eating a lot of bad food. When I sit it is just a big roll that I can pick up and squeeze really hard. When I stand it's the same.. It feels sorta hard under all of it, like it always does (not very hard). My boobs are not very sensitive. No morning sickness. It's just my stomach. PLEASE HELP ME.