Any harm in starting progesterone cyclogest tonight instead of tomorrow if I know I've 100% ovulated?

[Fingerscrossed38]

I've got my first natural fet on Tuesday at 1pm. I'm meant to start Lubion and cyclogest tomorrow (Friday) which means my transfer falls on the fifth day of progesterone.

I had a scan this morning and nurse said I definitely ovulated either last night or this morning and lining is 11.3mm.

So can I just start the cyclogest pessarie tonight to give myself that extra boost? Surely it can't do any harm? I think it's better to have more progesterone (I have low amounts naturally) for a bit longer...

I thought you needed to have 5 days of progesterone before you do 5 day blastocyst transfer on the sixth day?

Which day did you start progesterone and which day was your transfer??