I had unprotected sex with my now ex 13 days after my period. My period should begin today or tomorrow usually although it was a week late last month (never been this late before). The past several days I have had very thick white discharge, it's never been this thick before (no itch/smell etc). It is now 18 days since I had sex....should I be worried? I don't think it's an STD, we'd been together 6 months. Does this discharge sound like early pregnancy?