Only child? Or not

My duaghter will turn 2 in May. With my husband we keep going back and forward about having another child.

I'm so afraid, because with 1 kid I'm exhausted. I'm stay at home mom, so I've been taking my daughter everywhere since she was 2m old. She does ballet, swimming, little gym, and all the library classes. On top of that I keep my house clean and cook every day.

My husband says I'm overdoing, but if I don't do it who?.

I'm afraid this will get worse with 2 kids.

Also, my baby was planned 100% (thank you Glow). We had all we needed when we were expecting.

PS: I'm an only child, so I'm clueless about a household with more than 1 kid.