Off of Birth Control and Period is Late

So I saw some topics and didn't really see one that fit...I've been on birth control for 5 years, and my husband and I are going to start TTC in November.  I've been off birth control for a month.  We had unprotected sex on a 3% day right before my 'said period' was to start, but it never did.  I've read where this can make your period late, but I was wondering when you got a normal period after getting off birth control, and if I should eat or drink specific things to help get it back?