Weaning vs. IVF

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I got pregnant with my LO through

IVF. Now I’m ready to try for #2 using my frozen embryo but my doc said I have to wean my 13 month old off breastfeeding first. I was hoping to let her self wean but I also want to try and time pregnancy #2 to optimize how long I can stay home after birth (I’m a teacher). LO nurses to sleep mainly. I don’t know what to do and I feel torn. 😩

Any advice? TIA