Morning sickness.

People say it is really common. I just recently found out two days ago that I am pregnant. I didn't have any symptoms at all. I only tested because I had sex on my ovulation day. I tested two days before my missed period, which was supposed to start today, but obviously it didn't haha but is it weird that I'm not throwing up or not even having cravings or basically no symptoms whatsoever? I'm 4 weeks along and I've known of girls that felt it sooner.