Reassurance & Overthinking

Alright. So I’ve been on the pill since I was 15, I’m 20 now. And I’ve taken it everyday around the same time, I’ve had days where I forgot completely but that hasn’t happened in a really long time. Anyway, I’m supposed to start next week but now all of a sudden I feel cramped, bloated, I’ve been using the bathroom like crazy, my boobs have been sore and I feel a little nauseous. I thought maybe I could be pregnant, so I took a test but it said I wasn’t. My boyfriend and I use the pull out method and like I said I’ve been on the pill for the last 5 years. Could this just be from getting ready to start or maybe some sort of food poisoning?? I overthink a lot so if anyone could give their opinion it’d be greatly appreciated!