Spottings at 7 DPO, short luteal Phase

Hi,

I am TTC a girl for 6 months.
This month I have tried with one attemp and failed, but now I think the problem is that my LP is too short. I got spottings like at 7 DPO. Today at 9 DPO I was by a doctor, he confirmed that O was there and the lining seems to be good, but spottings are also there. He gave me progesteron-pills, which I should take from O to Af, if I didn't get pregnant.

In one thread I have read that atomic suggests Clomid to boost O/egg quality/P levels from the beginning so P level will not be low. But is it possible to have lower P level and a good egg quality at the same time? At the end I am not sure the egg quality is ok, this month I had O at CD15-16.

What supplements are best to lengthen LP and get rid of spottings?!

How will P supplements impact my sway? If low fertility meants pink, will this pills improve my fertility and sway blue? or pink? Should I try next month still one attemp with pills or many attemps without pills? Where are the chances for pink better? If I start with P supplements and get BFP how long should I take it?

Thanks you in advance.

I answered this in another thread so please reask anything that I didn't cover there.