How soon to test?

So I was suppose to get my period today but haven't yet, I don't want to buy a test too soon and get my hopes up, so should I just wait til the end of the weekend and see if I still get it? Maybe it's just late? Last night I had pretty killer cramps and wanted to throw up, I also have sore breast so I'm thinkin I should of started today.. Me and my husband just start last month on ttc :) so I'm sure it wouldn't happen the first try.. Advice would be great! Thanks!