TMI! Irregular period

Brittany
I started spotting (brown discharge) one week later than my expected period. All pregnancy tests are negative and I don't have any pregnancy symptoms, so I don't think that's it. Since then, I've been seeing only light spotting and lots of "old" blood for 4 days now. I've had no cramping and I seem to be having less bleeding/spotting today. I typically have the bright red, heavy day 2, usual period. I miscarried in April and my body seemed to have gotten back on track. Has anyone experienced a period like this before? Should I follow my regular 14 day ovulation cycle? We're TTC with our rainbow baby and I'm super confused! Thanks!