So confused...

Tiaonia

I been experiencing milky & watery discharge since last Friday. Cause I had unprotected sex last Tuesday and Thursday. My last period was September 10th and it always lasts for 7 days. I also have regular periods, I'm no where near irregular. As of today, my vagina is cramping but it's off and on. I haven't seen a sign of my period yet. When should I take a pregnancy test? And could I be having early pregnancy symptoms?