Pregnant with no detectable HCG?

Patient: I hope someone on here can shed some light on my situation. I am normally bang-on a 28 day menstrual cycle. I am now 23 days late for my period. I now have the following symptoms: strange taste, occasional nausea, bloating (my jeans are too tight), occasional sore breasts, occasional clear vaginal discharge, acne (this is unusual), and strange dreams. Over the last 3 weeks, I have taken 6 home pt’s – all negative. I went to the dr when I was 14 days late and they tested urine (negative) and blood (negative). Is it possible that I might still be pregnant?