Ovulation help

I miscarried on 1/5 and since then I’ve been tracking my cycle. As of 1/17 my hcg level was back to 0. Now I am getting odd ovulation tests. On the 19th when I started testing is was high, then started to drop, then today it started getting higher??? I thought maybe I missed my ovulation on the 18th...but now it’s going back up. Has anyone had this happen to them?