Is my pregnancy safe?!

So my period is due tomorrow, and I have 6 positive pregnancy tests from the last 2 days and today! My question is, how many days late does your period have to be for you to be “in the clear” or missed your period? Like if my period is 3 days late, can I assume I won’t get it? What about if it’s a week late, then can I assume I just missed it? Help! This is my first pregnancy and I am SO FREAKING EXCITEDDDD, I just don’t want to get my hopes up because I’m not in the clear yet:/