Strange bleeding

Johanna
Here I thought my body had adjusted after my late miscarriage 5 weeks ago. I got my period almost on time and my first three days of ovulation tests got darker each day. 
Then today it got a little lighter by that has happened before so I didn't think much about it but then I started bleeding again, not spotting but real dark bleeding. It stopped after a couple of minutes so I don't understand at all. I am on day 11 and should ovulate in the next couple of days but that doesn't seem possible now. 
The hospital made a follow up call after the miscarriage to ask how I was feeling less than 30 minutes before the bleeding started and I said that everything was doing great. Now I'm not so sure.