Period

Hello. So I got off birth control pill January 1st. My husband and me are going to try and get pregnant in the next few months. We have withheld from sex since I got off the pill. My period was supposed to start a week ago and it hasn’t. No spotting or anything. I am worried something is wrong. I know I am not pregnant. But I was on the birth control pill for 4 years almost. My first three periods since January was normal and on time. This one has no sign of starting and is late. Should I be worried? Is something wrong?