Implantation or period?

Hey there, so I’m currently 5 months pp and haven’t gotten my period back yet. We had unprotected sex once about 2 weeks ago, I apparently ovulated that next day so I’m about 112dpo according to cm that I was having which is the only thing I could go off of right now. So that is a hit or miss guess but this morning and yesterday when I went to the restroom and I had this and it was even lighter in the morning. Could it be implantation or my period finally starting? It was more brown this morning but still light and watery..?

I haven’t had anything sense and no other pms type symptoms I usually have- besides being more hungry than normal... I also haven’t taken any pregnancy test as of yet, will maybe take one tomorrow if nothing else happens.