Never failed for me...the day after a test was confirmed, I was sick! Not so much with my daughter...only a couple of times but my son was completely different...6-8 times everyday and I had to wear elastic waisted pants. Any pressure what so ever made me run to the bathroom.
Crackers and water became my new best friend and by the 4th month, everything was pretty much back to normal.
Enjoy being preggers and take it easy on yourself...no over doing anything!