Bella's birthday and age doesn't add up. Spoilers

Hi all, sorry if this has been brought up before I'm new to this group. So she's 18 when she married Edward, however when I Google her birthday it says she was born September 13th 1987. So they were married August 13th 2011. So going by those dates that would make Bella 24 years old when they got married. Also it seems like a bit fast for her and Edward to have their honeymoon (10 days if I remember correctly) then when they go home Jacob shows up at the Cullen's house and was told they got back a couple weeks ago. Then they all wait around while she's pregnant and gives birth, go through the transition to become a vampire. When Alice tells her happy birthday she responds by saying she stopped aging 3 days ago. So all that was supposed to have happened in less than 1 month? I highly doubt that since 24 days passed between the wedding and Jacob showing up to find her pregnant having out at the Cullen's for a couple weeks. Just wondering if anyone else noticed the discrepancies in the age/timeline?