letrozole and now sore sex?

Hi ladies, I have been ttc no.1 for 2 years. Consultant has said I have mild PCOS and am trying letrozole for the first time this cycle.
I do ovulate (most months) so not sure if will help but worth a go! 🤞🏻 I couldn't have clomid as my lining was already not quite thick enough
Anyway, I took letrozole day 2-6 and now on day 11 and started BD'ing... it was really sore to have sex, I don't normally have this?! Could it be a side effect of the drug/change in hormones?
Using preseed already but still sore... any tips? As if this ttc journey wasn't stressful enough! Xx