YES YOU CAN! I just got a positive HPT last weekend! I swear I felt symptoms 2-3 days after having sex on my ovulation day. It was not in my head (as my husband likes to put it). I was nauseous, had to pee more often than normal, and my boobs killed me. read more
HCG hormone is not actually produced until 6–12 days after conception (once implantation has occurred), so you should not usually feel nauseous until after this time. read more
Yes, but. It is not related to conception then (that early,) much more likely related to ovulation or even some other unrelated cause. read more