Clearblue vs FRER

Meghan • Married to my best friend 10-05-13. Considering conceiving. ?
I was due the 5th, still no sign of AF. I took a clear blue plus on the 7th and then again today on the 11th. Both said negative. I'm bloated, gassy, and nauseous every time I eat. Should I retest with an FRER? I'm usually on a 30-32 day cycle and I'm currently on day 39. My longest cycle was 43 days back in feb and 42 days in April. After that I've been on a 18-30 day cycle.