Help me understand!

Rebecca • Pregnant with 1st 💙 step mum to 1

Hi ladies, I've been temping since Jan and apart from one cycle of me having exam stress my ovulation is very regular, cycles are average 26 days long and I ovulate every month..apart from this month, I have no idea what is going on and my temps seem erratic, nothing has changed for me this cycle and I'm just needing any advice..