Opk & Charting Help!

The parhams • TTC Baby #1
Okay so here is a picture of my bbt chart. I took an opk on October 1st & it was positive. I took another opk on October 2nd and it is positive but the test was a little lighter than October 1sts test. Does this mean I ovulated October 1st or 2nd? Help pleaase I'm new to these!