Is Pregnancy Possible Without Ejaculatory Intercourse?

Hello I slept with my boyfriend and had dry sex and also he did not put his penis inside my vagina he kept it very outside and he s sure that he did not ejaculate at all but I am not pretty sure about the pre ejaculate it happened just about 2 days after my periods a Doctor has adviced me a deviry to get my periods again. is it safe to take that or is there any chances of pregnencu??