Please help!!!

Ok so here is my story.

So on December 15th I had sex for maybe like 15 seconds and then made him quit bc I was scared because he didn’t have a condom. I then took plan b 3 days later because I was still worried. Got my period December 31st and it was about 5 days and seemed normal. Then got my next period February 1st and ever since then I have been bleeding super heavily. So I have had my period for about 2 1/2 months now. I’ve taken like 20 pregnancy test and all negative but idk why I’m still so stressed out. Is there at all any chance I could at all be pregnant? Or am I just worrying myself? I know I need to go to the doctors but I just finally got insurance and I absolutely dread going to the doctors. Please help! 😢