@Hellotherebaby First of all, CONGRATULATIONS. Secondly she is no friend. What a horrible way to behave. 
When I got married, my (so called) friend from school who I had known for 15-16 years, was incensed. She said 'I should have got married before you. I have been with MY boyfriend for 6 years. How come YOU are getting married after only 3 years? Are you doing this to beat me?'
I was gobsmacked. I had seen her annoyed and pissed off because 3 or 4 other friends from school passed their driving test at 17-18 years old, and she had failed 4 times, and had still not passed at 19! And she was over the moon when she passed on the 5th attempt (at the age of 20.)
She was particularly chuffed because I hadn't passed MY driving test.. I hadn't had a single driving lesson, as I wasn't that fussed at 19-20 years old. I lived 15 minutes walk from work, there was a bus stop 2 minutes walk from my house, and a train station 10 minutes walk away, so I was in no rush to learn to drive. So I was perplexed that she thought she had 'beaten' me as I hadn't had a single driving lesson! (I passed at 24 btw.)
And then, as I said, she was furious when I said I was getting married. At 25 years old. She was so nasty and bitchy, that I didn't invite her to the wedding. She ignored me every time she saw me for after that. What a treat. 
I didn't see her much after about a year as I moved house, and was much further away from her. Then 3 years after getting married, I fell pregnant, and it got back to her. She still wasn't married, the bloke she had been with for 3 years before I met my DH dumped her after 7 years, and she told my friend who told her I was pregnant, that I was pathetic, and had clearly got pregnant to 'beat her to it.'
Fucking weirdo. Actually believed everything I did was to out-do her, and get there first. Totally deluded.
Last I heard, she was 42 and still single, and had never married. Not shocked to be honest.
People can talk about these so-called friends 'worrying about the friendship,; and so on, and other excuses, but in my experience, people who behave like this are plain jealous, and unhappy with their life, and can't bear to see other people happy.