When to test

So I haven’t had my first postpartum period yet and my daughter is 11 months old. I started feeling like I was getting ready to ovulate so I tested and the 17th-19 I got a high opk, the 20th I got peak. My hubby and I bd on 17, 19 and 20th. I had a little brown spotting on the 25th (like one wipe and then nothing more) and a very light pink spot on 26th (again only one wipe and then nothing. I don’t know when to test. I tested the 25th with a wondfo and got this and then tested this morning with the Walmart cheap test at 5 mins after. When would be the ideal time to take a hpt and when would I have ovulated? Could the spotting have been IB?