Is Pregnancy Possible Through Pre-ejaculatory Fluid?

My significant other and were I guess you can can call dry humping but I had my underwear on the whole time. At one point he did stick the head in for like 2 seconds cause I quickly moved away. My partner reassured me that nothing touched me and there was no cum or pre cum. After that we were dry again (my underwear was on that time too) and he ejaculated on a rag and his penis was directed away from my vagina. Should I be worried since there was technically direct contact down there cause what if he didn t realize he had some pre cum or something. Should I take an emergency contraceptive. I have no idea what I should do. I m in panic mode. I also heard that taking the pill on the day you ovulate stood the pill from working and I ovulate tomorrow.