Venting, comments from others

It took us a while to get pregnant with our first but we were very lucky and have a healthy little boy. Now that he’s one years old we get joking comments about when we’re having another one all the time. It’s mostly “Do you guys have an announcement to make?” Or comments about his “little sister” like “He could share that with his little sister” or “When his little sister gets here in 9 months”. I know it’s just teasing, but we started trying a couple months ago and it makes it hurt when people make those comments because I wish it was true and we were pregnant. No one knows we’re trying. My father in law makes most of them and I think he might actually think we are pregnant and is just messing around. But it still hurts