NEED HELP! Has this ever happened to you?

Ok sooo let me first start this off by saying I have NEVER in my 13 years of periods had something so strange happen to me.

I ALWAYSSSS and I mean ALWAYSSS have the same flow comes light before the first day hit hardest on day 3 and then starts calming down to nothing at day 6.

Now (currently) having the STRANGEST and most HEAVIEST flow/period of my entire life after having unprotected with my boyfriend like 3 times in the past 3 weeks (we honestly want a baby but also not rushing it)... back to the concern though. I am on day 5 at this point and after it weirdly paused which was red flag #1 it’s like a volcano(ok prob over exaggerating) but still way more than my Normal flow ESP by this day 5 my period is ALWAYS LIGHTENED up by this day so of course

I start freaking out googling (my boyfriend to) and we came to the conclusion that I could have an ectopic pregnancy which means baby could be growing uterus wrong part of my body. Luckily I had a pregnancy test on hand ... so I JUST took this test about 5 min ago (STILL ABNORMALLY BLEEDING HEAVY) and the test SAID NEGATIVE

So now I’m freaking out even more honestly because now I really have no idea what’s wrong with me miscarriage was also a thought but check this...... I not cramping WHAT SO EVERRR omg

Any ideas on what sounds like is wrong with me. Yes I know no one a doctor prob but just an outside perspective? I can’t sleep thank you :(