Pregnant? Super nervous! Pain in nipples

I know this sounds far fetched but just hear me out.

I got the implant in June. I had a blood test before that and three HPTS to make sure I was not pregnant, all completely negative. HCG count was less than 1.

(I hadn’t had sex for over a month before that)

I didn’t have sex until over a month past getting the implant as well. Then I had an ultrasound of my uterus/ovaries in August to check for cysts and my uterus was empty.

Now I’ve started a combo pill again for symptoms. 3 days ago my nipples started hurting really bad. I’ve had sore nipples before but this is more sharp. It’s just the very tip of the nipple, not the whole thing. And my boobs aren’t sore at all.

Now I’m super nervous. I took two Walgreens tests that were negative but why are they hurting this bad?

The last time I had withdrawal sex was very beginning ofMay.

is it possible I’m pregnant?

What should I do?