Ovulation

Can anyone help.

This month i got a positive opks on the night of the 15th (same darkness as control line) and the next day, 16th, I also got positives all day (test line darker than control line) I took the 16th as my positive and assumed the 17th as ovulation day. That would make me 5dpo today. I took a test this morning cause since last night I had tingling sensations in my breasts, I don't ever get that with pms, and had it with my first pregnancy. Didn't expect anything as 5dpo is too early. But got vvvvvfl! Did I calculate my ovulation day wrong? Could I have ovulated earlier and I'm more like 7dpo? Even that seems too early for a positive test...

Helppp not sure what to think of it. I'm gonna re test in a couple of days.