I'm 5'9 and was 115 pounds (very healthy was working out & eating healthy) when I found out I was pregnant with my surprise. Ive always been small, eat like a truck driver and can't gain weight for the life of me, apparently there's nothing wrong with me except an outrageous metabolism that will I'm positive has to slow down in the next few years. Got up to 150 and a week after my son was back to 120, was a healthy pregnancy & he was 6 pounds 8 ounces & I had a TON of fluid, pretty gnarly. My suggestion to you is when you do decide to get pregnant DO NOT get rid of you're pre-pregnancy clothes. I was convinced id never look or be the same weight ever again and got rid of 90% of my clothing...big mistake! Good luck to you & yours and I hope a healthy pregnancy for you in the future!