AF is due today

Erin

Last month was the first month I have ever used ovulation tests. For 3 days I had some brown discharge. Today my AF is due and no signs yet 🤞🏻. When would you test? I’m scared of seeing a negative! I’m 42 next month. Trying for a year now with a miscarriage in April. My husband (soon to be 31) and I already have 3 boys together so I feel my struggle is not quite like others. Not having any real pregnancy signs except my breasts are tender but I didn’t have many with my other pregnancies either