Late period and change in cervical mucus

I'm now four days late with AF and I only had cramping the first day she was supposed to be here. The rest of the days I've felt small twinges here and there. No other symptoms of my period but a few pregnancy symptoms. I'm testing tomorrow. I've also noticed for the past two days that my survival mucus has become this clear, jelly-snot like texture and the amount has increased every morning. I only see it when I wipe first thing in the morning. Is this an early sign?