Need your opinions please

Periods 3 weeks late, no signs of af or no bfp. I have heartburn,gas, white creamy discharge some slight nausea and slight cramping husband says I've been moody but I don't see it. Slight headaches and very prominent dark blue veins in my boobs and my nipples are slightly darker but not much, just not understanding why there has been no af or no bfp yet please give me your opinions and how long should I wait until I make a doctor appointment?