I'm just wondering how often I should do an ovulation test? I never used them with my son but because I'm still breastfeeding my cycle is way off and I figured ovulation tests would at least give me a semi accurate date of conception.

I had a miscarriage in July and we had no idea when I'd conceived due to not having a period in 2 months but testing negative up until the start of July. My period still hasn't come back but we decided to not wait anymore to start trying again. I've only just got a negative pregnancy test back last week so I've done an ovulation test today and the line was fairly faint but clearly visible. So when should I do my next ovulation test?