When should I take a test?

Taylor

So i have missed my period By 8 days now and don’t know when I should test cause I last tested on the 30 and got a BFN. I am having sore nipples, and cravings right now and mild cramps very rarely.

Also I was wondering why the app wasn’t showing when I when I was going to ovulate for February? Does it all depend on my period as well?