Hi Hays! Welcome to B&B!
As for your question about EWCM. Possibly, you haven't ovulated yet and are about to (you did say that you have been using OPKs since Thursday and haven't got a positive). Maybe due to the stress of TTC, you have ovulated late for your usual cycle.
Another posibility is something I read on 'Fertility Friend' - it says that you can sometimes get EWCM a few days after ovulating (the info about this is on their website), even though, strictly speaking you're not in your fertile period anymore.
I really hope you get your BFP this month!
