Personally, id wait at least one more week before getting too excited. Before I got pregnant this time around I did the same thing a few times. Id be late a couple days, get excited and then bam nothing and then a few days later Id start my period. Unfortunetly, sometimes period symptoms are the same as pregnancy symptoms in the very beginning. this last time I was a couple days late and I told myself...nope im gunna wait so I dont waste my money on a test, then a few days went by and I started feeling nausious at night. Thats when I was like you know....maybe I just might get that test. I got it the next day and sure as heck I was pregnant. But it took about a week and a half so Id say when your at least 2 weeks late then take a test. Good luck, I know how it feels to be excited and then you get let down. Hang in there, it'll eventually happen. It did with me and now im 37 weeks prego ready to pop at any time...finally! :) Hope this helps! ~ L.