TWW after chemical?

Hi, I’m currently 2DPO after my first ovulation since my chemical last month. I didn’t have a huge LH peak, but do believe I’ve ovulated.

I know any symptoms I currently have are from progesterone increasing, but after a chemical are these levels increased even more?

Reason for asking is I have some major backache & constipation which I usually have after ovulation but wow this is intense and much more than usual.

So surely it’s got to be linked to my last chemical?