Advice, Please!

I took a HPT on CD 32. Negative. I am now on CD 42 and no AF. My cycles are irregular, so there's no way of knowing if I'm late. 
I am having horrible diarrhea. I have been experiencing cramping for 3 days. AF symptoms or signs to take another HPT? 
Any help would be awesome, ladies! 
This is my 7th month TTC.