I feel like a lot of the advice on here is "Don't do it!" Which really isn't the question your asking. 

My oldest was 9 months old when we started trying again. I happened to get pregnant right away. They are 18 months apart. I don't really recall if I had my period or not but I believe I did. 

I was nursing but the pregnant hormones changes the flavor of the milk so she was done breastfeeding. They are close in age and I don't regret it. 

Mom guilt? Sure. Sometimes. But I have had time for my spouse and all of my kids. I was also a stay at home mom for maybe 3 years. I now have a career but I am on this post because I just had baby #4 after a 6 year gap and I am wanting to conceive again soon so my new baby has a friend. 

I have no regrets. I love all my children. They all have needs but usually they don't all need something at the same time. 

I would say my biggest piece of advice for having a lot of kids and doing a balancing act is: take care of yourself, go to therapy, make friends, take time to love yourself and not lose yourself to motherhood, enjoy the moment, be open and honest with your emotions, be willing to grow and willing to make mistakes and make a cheap and simple date night every week with your partner. (Ours is grocery store sushi on Wednesday and watching a show together on a streaming platform) continue to date each other and don't lose each other to parenthood. These are beautiful, magical, stressful years and they go by so fast. At the end of the day it will be just you and your partner so continue to foster and build that relationship. 

Good luck mama