I've accepted it... I think

So when AF came on the 13th I was devastated and upset. But I had no choice to accept it. I was so excited thinking "oh man this could be implantation bleeding" I don't even know how many posts I posted on here asking for advice. Buttttt, this month it was so crazy. It was definitely not my usual AF. It was much darker than normal and I only had 1 consecutive day of bleeding, which was Friday. But it wasn't enough to cover my pad. I'm a heavy bleeder and when I'm on my period the first 2 days are the heaviest. So I only bled for one full day. Then Saturday it was all gone, I had a few spots which was brown and then it just completely stopped like it never came. So yesterday, Sunday the 16th, I went to the bathroom and there it was again but this time it was pink like a lemonade color. And I had a wicked headache and really bad nausea that lasted all day. But then the spotting stopped once again. So today, when I went to use the restroom it's back to spotting but this time it's the brownish reddish color. I know my body, and I know AF and this has never happened!! Can anyone tell me what this means? I'm so confused. I took a test already and it came back negative, but something doesn't feel right Not in a bad way. I just can't place my finger around it, something is off. Please help me out! This is stressing me out!!