It's up to you my dear. You have to be comfortable with having children; no matter what age you are. Tired is tired. Some women say that they fared better in their forties, then their twenties. I will say this much. Having two children instead of just the one is tiring. I had my son at forty and my daughter at 43. Children keep you young. My children are very active and I take them out daily. We go every where together. I take them out to playgrounds every day as it tires them out. I don't get a lot done. It's only myself and my husband and it makes for a messy house right now.
I enjoy and love it all. All I will say is that I wished I started sooner as I would love to have more. My hubby and are always agreed on just two but I didn't know that I would love it so much. I wasn't sure If I was going to have children. I really loved my life and I knew having kids would be a lot of work. I don't consider it a job; it is my life; they depend on me. A job can get someone else but no one can take mine or my hubby's place.
If you are fit and have energy to give, then I say go for it. You have to really want to have more kids because it takes up so much time and energy. My daughter has been teething for quite some time but some times she can't get comfortable so I get up with her on the hour. Not to mention that I'm still breastfeeding her at 16 months. I bf my son until he was 3.
I did a lot of wonderful things before I had children; I enjoyed life; I have to say it's much better with children in the mix.
I hope this answers and helps you in any way. You can always contact me.
Let me know what you decide. . . you might be pregnant already.
R.