Okay! Thankyou so much for your advice :)
Make sure you take a test! 3-5 days after implantation bleeding it will show positive on a HPT!
I've only had it twice. The first time lasted 2 days. This time it lasted 3. It's over now, I'm not doing anything anymore. I've never done this between periods before.
Implantation bleeding is rare, most women don't get it, and when they do it's a one or two time spotting that is pink or brown tinged discharge, so it's doubtful it was implantation bleeding. Also, most women ovulate about halfway through their cycle, or 14 days before their next expected period, so it's unlikely you're pregnant from that, good luck!!