there's good reason why the doc said under 30 hun.

I was 27 an when W was 1 I got my tubes clamped...reason was because I knew my child was 'different' and I had to give him my everything...anther child, I was led to believe would interfer in that..I woke from surgery and knew i had made the wrong decission. That was in 2003...it took me almost 3 years to get a reversal, which I might add was extremely painfull.
When we had V we were asked as I was having a c/s if I wasnt my tubes 'done' and both J and I screamed NO at the same time (this was whilst being wheeled to theater mind you.
After having a horendous pg with M and him almost dying that we would have my tubes removed if anything, which we did. Reason being...I fell pg 3 times whilst my tubes were clamped..so beware..nothing is 100%

Good luck