When should I retest? (Faint positive at 8dpo)

Hello!

I got this faint positive at 8dpo on first response. The Walmart cheapie was negative yesterday (9dpo), though. I’m wondering when I should retest? I want a nice dark positive finally!!

I had a chemical pregnancy in April, and I’m nervous to get a bfn after this. I had crazy symptoms before I took this test, but they’ve tapered off (I’ve read that other women have experienced this and gone on to have successful and healthy pregnancies). I’m still very crampy, but no sore boobs or anything anymore.