me and my bf indulged in some foreplay n sexual intimacy without penetration just one day after my periods (post period sexual intimacy). I'm 19 n virgin , we had our underwear (very thin hipsters) on during the entire act. I got massive ejaculation stains on and near my underwear which was already wet. could i be pregnant from the same and do i need to take any emergency pills as its been just 30-33 hrs since then. please help.