No CM... What does this mean?

Ames • Baby#2 due May 2020
I've just had four days if EWCM, but no temp spike and negative OPKs. Today I've basically had no CM at all (TMI, sorry!) and I'm confused... Am I ovulating but the OPKs haven't detected it? Is this normal? It's my first time charting this stuff. I take my BBT first thing in a morning before I get out if bed (it's the very first thing I do) so they should be accurate. Any idea if this sounds normal?