Due date

Brice • 19 years old, first time mommy with my wonderful husband who is a first time daddy (21). Expecting a beautiful baby boy in a matter of time ...more excited than words describe!
Does anyone else's due date keep changing? Every time I go to my OB it seems like my date is changing... they tell me I'm a month ahead, and then I'm 2 weeks behind and then I'm right where I was originally but my past two visits they've been saying it looks like I'm 2 weeks ahead.. anyone else struggling? It's making planning really hard!