When should i test????

Maryna • Single mommy 🌈 rainbow baby amilia 11/20/16 ❤️ with another due 06/29/18 🤰❤️
Af was due yesterday and still nothing! I woke up yesterday with mild cramps and some nausea and today with a back ache and nausea ... could this finnally be my month????? When should i test?!??? Im getting so anxious now !