2 children??

Iv been a single parent since my gracie was born 22 months ago and done everything and most of the time its been amazing but sometimes it gets so hard but i cant help but feel broody i dont want another baby till grace goes to school but im desprate for another baby and to be pregnant again! Is ther anyone that can help? How do wot cope with 2 young children being a single parent? Is it normal to want another baby this badly? I no it wood be stupid to have another baby cuz of my current situation but i think about it everynite before i go 2 sleep ???