Extremely Paranoid

I haven't had sex in about 2 months and even then we used a condom and he didn't finish. And I take birth control, and I had a period last month.
I started taking birth control early January and lately, I've gotten really bad at taking it at the same time every day (I take it every day, but sometimes it's an hour late and sometimes it's 12 hours late) because I stopped having sex.
Anyway, I feel like I'm gaining weight. And for the last few weeks, I haven't been able to eat a single meal without feeling like I'm gonna vomit. And I'm always tired and dizzy. 
I know I'm not pregnant, but can someone please assure me that the idea of even being pregnant is ridiculous? 
My period (which was supposed to start yesterday according to my birth control) is late, so I'm waiting for that to be 100% sure, but for now I'm super paranoid.
Could all of it just be a reaction from not taking my birth control at the same time?