Should I test?

La
hi ladies. Any advice would be lovely. I expected AF 6/4. She has not yet come. My cycles are like clock work. Spotting the day before AF is expected and AF the next day. On Tuesday I took a FRER and got a BFN. AF is now two days late. When should I test again?Symptoms include: - constipation one minute, diahrea the next. - nausea on and off - back pain- cramping on and off- headaches - fatigue - sore side of breast - foggy feeling - sensitivity to some smells.