What should I do!?

So I'm 3 days late.... We have been ttc for 9 months now. Still no luck. Every month my period shows up on time every time (even when we pray it wont) Now all of a sudden I'm late, ive taken multiple pregnancy tests since the day of my period and all say negative. Again I don't have irregular periods and mine shows up on time every time. I've had pregnancy symptoms like migraines, nausea, vomiting, fatigue, sore breasts, and cramps but no blood and no signs of AF showing up anytime. Thoughts on what to do anyone!? What's wrong with me!!???? HELP