Help!

W

I’m trying to figure out when i conceived. April 16th was my first postpartum cycle, I am 15 months pp and still breastfeeding. Did the deed April 28 and May 7. Noticed egg white discharge May 1-5. Tested on Mother’s Day and it was very negative. I’ve always tested positive around 8-10dpo. I got a decent positive on May 17th and confirmed with a digital. I’m thinking I ovulated late on May 7th and conceived then due to the late positive test? Any insight?