Missed ovulation

I track my cycles every month i always know when i ovulate and period predictionis always on time this month i forgot to test untill it was too late i missed it and logged it which threw my cycle prediction off. I have been feeling very off here lately like last 3 days or so i feel very tired like in my eyes theyre heavy i have low energy headaches and today feeling nauseous we arent actively trying he pulls out which i know isnt always 100% effective im just not sure when i should test or is this is pms im not even 100% sure

when my period will start

Help, advice, suggestions please any input is much appreciated