So far as I can tell that text is pretty useless, sad to say. I got my text two weeks ago and then 10 days later my EDD got pushed back by three weeks
Here's my timeline:
EDD As of:
10/15: EDD February 02 - February 22 (48 days with this EDD, 20 days since OD)
12/02: EDD February 14 - March 14th (58 days with this EDD, 68 days since OD)
01/29: EDD February 19 - March 5th (3 days with this EDD, 126 days since OD)
02/01: EDD February 20 - March 20th (3 days with this EDD, 129 days since OD)
02/04: EDD February 24 - March 10th (17 days with this EDD, 132 days since OD)
02/11: Received Trade in Text
02/21: EDD March 11 - March 25th (Current, 153 days since OD)