how often?

Laura 🇬🇧
So today I got ewcm and glow says my fertile period begins tomorrow. It predicts Sunday as highest day but I know it's not accurate. 
My OPK was darker today but not positive. So the arrival of ewcm today means I'll BD tonight, but should I do it again tomorrow etc or stick to every other day? I want to give my best chance so want to BD lots, however I'm worried that will weaken the sperm? What's the best option? Thanks x