M.P.
I don't know if there is ever a "Right time". And even if you try to plan it out - it doesn't always work out as planned. I always knew that I wanted 2 children and that was it. So for me - I knew that once I was pregnant with my second - this was it for me. I really tried to cherish it (even the morning sickness - yuck). I thought it was easier - I felt I had more experience and wasn't so worried about every little ache and pain. When he was born - it was difficult. The first 6 weeks were very exhausting and it was hard to juggle and transition into being a mommy of two. But my daughter was almost 4. She was a big help and I love the age difference. I had much more confidence in myself as a parent also - so that made it easier and more enjoyable. Now that she is 7 and he is 3 - they do play together some - but not as much as two younger siblings might.
It is scary, but you are a great mom and you will do fine no matter what you decide. Good luck!