I am 5 days late

Lauren • Married 9/9/17. TTC 1st, And have 2 amazing step children :)

I am 5 days late and I doubt I'm pregnant. my periods have always been on time right down to the day. but for the past few months they have been late! What can I do to fix this?? We just got married on September 9th and now I really want to get pregnant. I want to buy a test, but every time I do that I start the same day. waste of money