When to test??

Chi

So I’m 15dpo and Glow says my period is 1 day late. For the past 6 months my period has either been right on time (30 day cycles) or as much as a week early! I’m not very sure how much to hope because I had a cp recently too so I don’t want to test too early or get too excited just yet. I’ve been leaking really watery cm the past few days and started leaking breast milk?!? The day my period was supposed to show. That’s random. I’ve always been able to squeeze out a tiny bit since bf two kids but never expressed like that in the past. Also my breast are very tender and tingly lately and that’s not a typical pms symptom for me.

Update: I didn’t test but my period came yesterday 😩 very sad. Hopefully next cycle