Clear Blue Digital Tests

So I'm meant to be 4 weeks and 3 days, I baby danced twice last month and I think I O shortly after AF had finish,  because it coincides with when I BD.  Really confused with this reading, it's FMU I did the test with.  Miscarriage last November so I'm thinking my cycle still wasn't regulated properly.  Not sure what to make with it.  No symptoms, maybe tender boobs sometimes but that's it.  Has anybody ever had something similar