So the 3rd is the first day of your last period? In a standard 28 day cycle you'd ovulate on day 14, so the 17th, which is only 2 days ago. You could have a fertilized egg there, but it'll take a few days to get to implantation and start releasing the hormone that causes the sickness. I'd wait a while, but good luck, I have everything crossed for you!

Sent from my HTC Desire using Tapatalk