I know I'm Stupid

so...I know I'm gonna get attacked for this but I need major help. My boyfriend and I had been having unprotected sex, but i was on birth control when we started. I had been on it for over a year and maybe missed my pills 2-3 times out of that. I figured we where in the clear once my mom decided not to refill it because it was around Christmas and ya know money gets tight. Well he pulled out every time just for us to be safe because he knew I was off the pill. Now for the past month ive been having nausea almost everyday, killer migraines and headaches, I've been gaining weight even though I'm on a diet ( i was loosing weight the month befofe this and I gained some back so I got confused) my belly is getting bigger

but I just keep thinking its fat. I'm honestly trying to doubt pregnancy but at this point idk. i took a pregnancy test before because my period cycle was off and i took it hella wrong 🤦🏽. I could get another test but I don't want to go through all the effort of getting one of its a false alarm or my imagination.