Need a bit of help?

Hey gals, I had sex for the first time in 2 years on the 12th August. Stupidly We got lost in the moment and didn’t use contraception but he did pull out. (I know there’s still a chance of getting pregnant with that method) I took a test 14 days afterwards which was negative.

Two weeks after I had 3 days of really light bleeding, no cramps etc. (Normally my periods are extremely heavy and cramps galore) took another test when that finished, again negative.

Since then I haven’t had a period. (Very unusual as I’m pretty regular) But I’m super bloated, I feel nauseous every now and then. And I’m cramping badly. It’s making me feel so down. Do I need to go to the doctors? Or take another test? I don’t think I am pregnant because of the two negatives but I don’t know what this could be!

I’m not stressed or on any medication to cause this.

If anyone has any advice it would be welcome!! Thank you!