7 days late and a lot of discharge please help!

Meghan
I am 7 days late and for the past 3 or 4 days I've had discharge that is white and clear. I tested when I was 2 days late and got a negative result. I also have sore breasts and some nausea that started two days ago. Why am i having so much discharge? And how long should I wait to test again? Thanks y'all!