When to take a test?

So I haven't missed my period yet but all 3 of my apps I have say different things for when my period is supposed to show. I had light pink spotting 4 days ago but only when I wiped, 2 days ago spotting again but light brownish and only when I wiped. Tonight making dinner I felt so nauseous and have had cramping on and off for the last couple days. When should I take a test? Or do I even sound like I could be pregnant? I'm not sure when I ovulated last month but we BD almost every day. TIA *edited to say 1 app says at is due tomorrow, 1 says 4 days and this one says 6 days