TMI - no picture just advice needed

Xoxo
According to Glow I am 4 DPO, however, today I've been experiencing clear, "slippery" dc. Doesn't that normally happen when you're the most fertile? Also, I've never tracked my ovulation with strips, but I'm going to after this next cycle (hopefully AF doesn't come & I won't have too!). I know with my daughters I conceived in the ovulation window of a typical 28 day cycle, but that was 10 years ago. Please advise if it means we should definitely still be BDing every other night.. AF due 1/20.