Pregnancy symptoms but negative tests?? Freaking out??

This is going to sound completely bizarre, but something just isn’t right, pregnancy related or not. I’m really posting this just for reassurance & for someone to tell me that I’m overthinking because I’m genuinely freaking out.

For WEEKS I’ve been so dizzy to a point where I’ve came close to passing out. I have blazing headaches that make me extremely sensitive to light. I also have weird abdominal cramps I don’t usually get when I ovulate / get my period. I’ve also been experiencing bouts of lower back pain. I’ve never really experienced all this at once, so it’s definitely concerning.

Now, I have been getting periods - despite this, I took three First Response tests and they all came back negative - two sticks and one digital. They were obvious negatives with no additional line. I know it sounds wild that I’d test despite getting periods, but these symptoms are just too hard to ignore. I’ve heard of instances where women had periods during pregnancies so I just wanted to double, triple check.

My boyfriend and I consistently use condoms and we are always EXTRA careful. We have never had sex during my predicted fertile window, and he has never ejaculated inside of the condom - I always, always finish him off by swallowing or on my chest. We even check the condoms by applying water afterwards. We’ve never, ever seen a hole or leak.

I absolutely think I’m overthinking, but there always is that slim, slim chance. Rest assured, I will be going on birth control soon.