Its very unlikely. It takes 14 days AFTER sex until your body realizes its actually pregnant. So symptoms will occur 2-8 weeks after conception not 3 days after.
It is possible though. Once fertilization occurs, the fertilized egg remains in the fallopian tube for 3 days. It then enters the uterus where it gets very close to the endometrium (lining of the uterus) and begins to invade this endometrium to implant. You can feel implantation cramping usually 6 to 10 days after ovulation. However it can happen a few days earlier or later.
Sensitive to smells is a definite sign of pregnancy. Craps and pains could be pregnancy, but could also be your period. Take a test to be sure.
Gas!
You will start to feel pains in your stomach if you dont start feeling pains you should go to a specialist.
If you sometimes have difficulty breathing and get pains in the chest, head, and stomach, you should see a cardiologist and a pulmonologist to get a proper diagnosis.
Eat!
First you have a tempture then you get stomarch pains or cramps and feeling sick then you get this spitty feeling in your mouth and then you vomit that's when you have a bug!
You are not pregnant. The pains could be caused by something you ate, etc.
Could be a lot of things. Some of them are pretty severe. Better get medically checked out.
something serious but not pregnancy. see a doc
Tender breasts and sharp pains in the stomach can be PMS or cysts.
obesity
just because you have stomach pains and nausea, does not mean youre pregnant at all. though it is a symptom, it is but one. it could be any number of things. did you ever think that you could actually be sick? a more proper question you could have asked wouldve been, is it possible. the answer to that would be yes.