38 just had our first

Anyone had their first this old? Dr said if we want a second to not wait more than 6 months to try. This baby took us 2 years and a mc. We want a second but trying to decide if that's not a good idea now. If we conceive right away i will feel bad for my daughter and the attending she will be deprived of. If we don't conceive right away I'll be over 40.