Ovulation advice please so devastated! TMI photo

Stacey • Baby #1 born sept 2015 Baby #2 due Oct 2018
Hi Girls
​Really in need of advice been in floods of tears it's the first day of my fertile green window and after BD this morning I started brown spotting. I'm off the depo so upset if this is the start of another period just when I thought I was becoming normal. I've done 2 opk and the second one is the darkest it's ever been. Please do u guys think the spotting could be from ovulation? I've had nothing since first thing this morning 8 hours ago. Love you girls all comments appreciated.