Can’t decide

Where to start? My youngest is 9.5 months old. I’m 37 years old. My husband and I have been debating having a fourth child. We were waiting to make that decision after Hannah turns 1 year old in October. However, my iud came out 3 days ago. I’m having withdrawal bleeding now. I can’t decide if I should start another form of birth control or just see what happens naturally. I don’t want to have to wait later for my hormones to reset, but I’m a little worried about not having enough time between pregnancies. My husband has been of little help making this decision.