Hi Me And My Bf Were Cuddling Naked Day Before

hi me and my bf were cuddling naked day before yesterday,we didn't had intercourse but i was sitting on the top of his p***s not on the tip and even i use the same tissue which he used to washed his precum, is there any chances of pregnancy? after 30 hours of this i had duoluton l 1 tablet and next morning i starting spotting why is this happening ? and how many days i should continue duoluton l to avoid pregnancy?