So I had sex with my boyfriend at the time 4 months ago and it was unprotected. After that I've been having headaches non-stop everyday and still have one but they aren't severe, I usually get one or two a year. And I have some weird feelings in my stomach and get these hungar pains that start from the sides of my stomach and travel to my back. I took three home-pregnancy tests on three separate days and they all came back negative In July I had my normal period in the begginning of the month and got it again on the 21st, and I've been on it for three weeks, and it's a brown discharge sometimes a little red. And I'm not on birth-control. So my questions are: am I pregnant? Is it hormonal? And do I have low hcg levels?

What is your age.. . if you are perimenopausal this could be "normal" I would see my ob/gyn today and have an exam and appropriate blood work done.
There are many things tha could case this.. not just perimenopause or pregnancy. Good luck

I'm 18 by the way thank you for the advice