No, youre not pregant as it is protected and negative in PT, maybe youre delayed because you overthink too much.
Pregnancy tests are pretty accurate. Take another one, if it is still negative, it is doubtful you are pregnant. You are now having a period? Trying to understand your post. I had periods every three to four months for over a year due to a slow thyroid and production naturally in my body of too much estrogen. You can't be scared to go the doctor. Taking care of yourself and facing situations is part of being mature enough to have sex, hon. good luck