@lijuea I don't get people bashing the pull out method. It's not 100% effective, and yes, you need to trust your partner to pull out (due to the lack of condom it's only really advisable in a committed relationship anyway). Unfortunately, nothing other than abstinence is 100% effective.
For 8 years it worked for you. It sounds like you didn't just get lucky for 8 years. It was effective for 8 years, and you only got pregnant previously when not using the method. That says to me it was working. The fact that it's not 100% is why you're pregnant now.
I used the pull out method effectively for 9 years with my husband. When we started trying to conceive , I was convinced we'd have problems, because the pull out method had worked for so long and people act like it's just asking to get pregnant, so there must be something wrong with one of us. However, we conceived no problem, the first month we tried. Again, pull out works, it's just not 100%, and should probably be used with another method if you definitely don't want to get pregnant.
I have friends who got pregnant on the pill. I have read stories about people who got pregnant with IUDs. Hell, my sister was conceived after my dad had a vasectomy.
The lesson of this post should be that Birth control is not 100%, not that the pull out method is a bad form of birth control, and that it might not be a bad idea to double up if you really don't want to end up pregnant.