I would at least wait untill the 3rd or 4th day after my missed period. Also a little secret for you ladies out there, I have never bought a name brand pregnancy test and I am on my third pregnancy. I went to Dollar General and the Dollar Tree to get their one dollar pregnancy test and it accurately told me that I was pregnant and it accurately told me when I wasn't. You are just paying for the name. Also for all your curious expectant moms out there, I took the baby gender predictor(I know I am such a sucker) and it told me I was having a girl. I cried because I was hoping for a boy after two girls and this is my last pregnancy. I know, I know I shouldn't have put any stock into it but I did. Well imagine my suprise and relief when I definitely see a little wee wee in between the baby's legs on the sonogram. So it is not 100 percent accurate just in case you do decide to get one. Good luck and I hope you are.