4 days late, neg test

Kayla
Ok ladies, my fiance and I are ttc for #1.....my cycles are always dead on 28 days give or take a few hours......I am now 4 days late with no signs of AF, I usually cramp a few days before so that's how I know she is comming. I have A LOT of clear, watery discharge to the point where it has me running to the bathroom thinking it's AF, sore and swollen breasts mostly around the nipple area, and an appetite like never before and gas like crazy. TMI I know, sorry! I took a test the day of missed period, neg result. Took a first response digital yesterday, BFN....I don't know if I should call the doc for a blood test or not, just wondering if anyone else had this before they finally got a BFP or not? Please help, I'm soooo anxious.