When did I ovulate??

Wondering if anyone has any ideas as I’ve been tracking my ovulating for a while and can never tell. I usually go off the higher LH using the Premom app (getting a 0.9-1.2) I have PCOS so I didn’t have regular periods so it can be difficult to determine but I have in past cycles pin pointed ovulation and then got my period when I expected it. HOWEVER! I didn’t think I had ovulated yet this cycle but I must have as I found out I’m pregnant (got a super don’t positive on 21st May). I’m wondering if anyone has any idea when I ovulated as I’m baffled…. 🙈 Second image in comments.