I had one...it just wasn't the right time. We got married in April. I'd just gone back to work in June, after being out of work for a number of months. It wasn't my chosen field, but my sister had pulled some strings. My husband was in the middle of doing his PhD...there wasn't a lot of money coming in. As it is, I lost the job( it required walking all over Manhattan lugging samples) as I was exhausted. We were NOT ready to be parents...and I took a break from the pill at the "wrong" time.
I think of that child often...it was not a decision taken lightly.
I don't believe there are many women who will use abortion as birth control...there are easier, safer methods now. I had a friend who had one not long after me...she ended up with a terrible infection. Luckily, she was still able to have children.