What Causes Clear Vaginal Discharge Along With Abdominal Cramps?

Hi. For the past day I've had a watery discharge so bad it ran down my legs and my pants were wet. It has no odor or color& my period is 3 days late.
I have been having unprotected sex, & I've been having cramps and been sweating a lot at night. Any idea what this is or if I should take a pregnancy test?
Thank you!