Pregnancy/ birth control

Okay so I’m on the pill and I have been for 6 months. I’ve had lots of issues with it. Well we had sex July 3rd and we did use a condom but, it was too big. Well I got a heavy breakthrough bleed (a period that wasn’t supposed to happen) a week later. I figured, yea this is normal, my pill has me fucked up. Well then I got really sick, and I was getting around the time I was supposed to have my period and I was spotting for 4 days before my scheduled time. Then o never actually had a period. So I Took a test. It was negative. Then a week later, I was still sick. So I took a test the first of this month. I was still nauseous, so a week later I took another test. All have been negative. I went for my physical, I’ve lost 6lbs in the past month. My anxiety won’t let me eat, I’ve felt so nauseous, my head hurts a lot and my boobs hurt. How ever, I switched birth control pills about 2 weeks ago and that’s when it got worse. So maybe that’s it but I’m not sure. I’ve been very depressed due to Losing a father figure and I’ve been stressed and scared. At my physical I was diagnosed with severe anxiety. They want me to do something about it and they gave me 3 options so I’m worried about that. I’m Always tired too and I’m scared I won’t get my period. All 3 tests have been negative. My vaginal discharge has been a white color and my nausea feels like an acid reflex. I have been eating more bc now I get dizzy. I’m just scared I could be pregnant.