Late but negitive test

Well i am normally on a 32 day cycle. Im now 36 days and still preg test saying negitive. The other day i went for a wee but when i wiped there was a string off discharge about 3inches long. Iv never had that before. I seem to have alot of cervical mucus. In my body i feel ache all over. I keep getting cramps amd like a bubbling sensation in the middle off my pelvis. Can anyone suggest anything i dont want to be disharted anymore with testing. Im trying to be patient