New to TTC

Hi everyone. I am new to TTC and have been using the glow app as guidance. I started taking ovulation tests when told by the app and finally got a positive for LH on 2/6 (it was like the 8th day testing). My husband and I were intimate at least 4 times throughout my fertile window including the 6th. Today I'm 1 DPO and woke up to heavy bleeding with some clots. This evening I had some more clots but the blood is mostly bright red to dark red. I had some tan/brownish CM last night prior to the bleeding this morning. I've been reading a lot and it seems like it's too early for implantation bleeding but my period is not due for 13 days. Any ideas on what the bleeding could be from?