All the symptoms.. 2 BFNs... What's going on?!

Manda • I`m 30 and have 2 beautiful girls
I am 5days late for AF and for the past week I have been feeling nauseaus, tender swollen breasts, peeing every 10mins and spotting and cramping. I have done 2 clear blue tests and they have both come back with BFN!! I'm so confused! What's going on with my body?!!