Femara and breastfeeding trying for #2

I am still currently breastfeeding my 11 month old (1 in three weeks) we are ttc number 2. My doctor gave me femara to take this cycle. The pharmacist says it can’t be taken while breastfeeding. We have a very short window my husband is leaving in May for Afghanistan for a year. That only leaves April and hopefully mays cycle. We are both in agreeance In wanting one more. I just feel like I’m shortchanging my oldest. I don’t want to wean her just for the medication but it’s the only way i can get pregnant. We tried for over a year for her.