B.,
I have 3 kids now, although my oldest lives with my in-laws... she is now 12 and was born when I was 17. I when many years being told that I couldn't have anymore... then suprise I found out I was expecting.
Right now we have 2 little ones under our roof... My baby girl just turned 3 last week, my Bubby will be 2 on June 9th and we are expecting another little boy on June 14th. I love all my kids dearly... and wouldn't change a thing - well to have them all under our roof, but the oldest is happy where she is. It can be stressful, but I'm sure you know that having 2 under 2 also.
I didn't exactly plan what is happening with me... I did want a min of 4 kids growing up, but going years with 2 doctors telling me it would never happen I didn't expect it. My kids are the most special thing I have and their smiles are the best gifts I'm been given.
When you are ready your heart will let you know, or it will just happen. We are only given what we can handle... we just have to figure out our way. Remeber - love is strong... as long as you have that nothing else matters.
LOL here I am still expecting #4 and sometimes we talk about #5 and how we need a bigger house. (We joke about being in a race with my sister - she is expecting #5 in July... and she didn't want any growing up). So, odd things do happen, but a loved baby/child is so special.
Good luck and I do hope you make the right choose for you and your loved ones - no matter how many it ends up being :)