Implantation or Period?

Rachel
So I quit BC in November, had a BFP on December 13, then MC on January 2. After that cycle has been 35-37 days. This cyle I started on day 37 but it was light the entire time and only lasted for 2 days.... I also had mild cramps the first morning and that was all. I'm so confused.... Any thoughts?? Thanks 😊