fostering while ttc?

is anyone also fostering? i just haD a baby boy who is now 2 months old and we just go a relative of mine as a foster placement and she is going to be a year old next month and every one keeps asking me how I'm doing and who is helping me take care of the kids during the day i think they don't believe me when I say I'm doing it by myself. i dont under stand what the big deal is peaple have babys back to back all the time. she is a very good baby and so is mine so we have a realy good system down and its working out realy well. im not telling any one that we are going to try for a baby as soon as we can (which could take a while because I'm breastfeeding)

because every one is kind of giving me a hard time about having three kids in the house already.