Something is wrong!

Okay, so to start off I'm going to say I am irregular which makes it so hard TTC. Anyways the problem is. . I haven't gotten my period in 2 months which is weird because although I am irregular, I would still get it sometime every month. I may not know when. But I still get it every month. And the fact that I missed 2 months already is having me confuse N frustrated. And no I'm not pregnant :(

I've tested also went to the doc .. but they said hcg came back negative :(

So what's really going on! What should I do... Could I be pregnant N not have a positive? ? Idk what else to think. Someone please calm my nerves.