October 18’ babies? What’s your lmp and due date?

Any ladies due in October and been to the doctor yet? My appointment isn’t until March 9th 😕 This app says I am 5 weeks tomorrow according to my lmp(Jan. 5th).. buuut when I called to make my appointment the lady over the phone said I am yet to be 4 weeks when I gave her my lmp?? Maybe she misunderstood me. Just very anxious to know