Huge temp spike at 4dpo?!?

Holly

Hey girls-

So this month I ovulated Monday just gone (glow has it wrong).

This morning at 4dpo I've had a huge temp spike- highest I've ever had (I also never spike after ovulation). I know it's too early for implantation spikes, but I've had cramps and backache for 3 days, and this has thrown me!

Any help I'd much appreciate! Xx