Tubes tied?

I'm 23, 24 in Nov...pregnant with my 3rd due Aug 7th. I have 2 boys, the oldest will be 4 in October. The youngest just turned 1 yesterday. I'm considering getting my tubes tied when this little girl comes. I told my doctor that was going to be my method of BC.....then she gave a a speech about how I might regret it being so young and not married to my kids father. That's our plan to get married...but I don't know if it's my hormones or what but I just don't see it in the future...I love him dearly but...I'm just not feeling marriage anymore! I know this is a <a href="https://play.google.com/store/apps/details?id=com.glow.android.nurture">pregnancy app</a>...but do anyone know someone who regret getting their tubes tied at a young age?