thoughts please

Gemma
Hi all, 
I am new to taking my btt, but today I have got up feeling sick, I don't know how long my cycle and I don't know when I ovulated. Could this possibly be an implatation dip? All the <a href="https://play.google.com/store/apps/details?id=com.glow.android">fertility apps</a> I have show average cycle so they think that AF between today and Wednesday should I test today or wait a couple more days to see if temps stay up?