Girls, hello ? Mini-story. My husband has a positive Rh factor, my son…

Girls, hello ? Mini-story. My husband has a positive Rh factor, my son has a positive two, and I have a negative three. Today I had an appointment, and the doctor said I need to inject Immunoglobulin at 28 weeks, but here's the thing: I can't remember if they injected me during my first delivery, I can't even remember, after giving birth they injected me or not, you know, the brain says yes and no, I don't know how they injected me or not, and I'm very worried if they injected me again, it won't harm the baby, or if they didn't inject me and didn't give another injection,