Rh negative blood type


So, when I was pregnant with my son, I found out I was Rh negative. When I was 28 weeks pregnant, I got a Rhogam shot to protect baby, and was told that if my babies blood type was different from mine at birth, I’d get another shot within 72 hours after giving birth to protect the next pregnancy. I’m currently 5 weeks 3 days pregnant and am wondering if I need to get another rhogam shot now, or if I’m just gonna get another one at 28 weeks.?