Advice?

So this is my first time posting on here, and I’m a bit paranoid right now...I wanted to see what all you ladies think of my situation and hopefully give me some advice?

My boyfriend and I have been dating for a yeah and a half (we’ve known each other since middle school). I’m not on any form of birth control due to health reasons, and he is aware of that, so whenever we have sex we always use condoms. This whole week though there’s been a few thing concerning me (again this may just be my paranoia kicking in).

I’ve been getting really bad acid reflex since Monday, my nipples have been SUPER tender since Wednesday, and today it feels like my uterus has been pushing against all my other organs all day. My periods are very irregular, so it’s a guessing game as to when I get mine let alone when I ovulate. With these symptoms making an appearance, I’m worried I might be pregnant.

I have taken a few ClearBlue pregnancy tests and they came back negative, I do plan on buying a few more (maybe different brands too) just to confirm. I have a feeling they’ll come back negative, but I can’t say for certain.

Here’s where I need advice: if I keep getting negative tests, should I go see a doctor to get this checked out? I really can’t afford a baby at this point in my life (which makes me a little sad, but finically I just can’t). Any advice is welcomed!

(Also please be nice and don’t judge me. I’m gone scared what the tests come back as and this has been emotionally draining)