Rhogam shot when both partners are negative?

Ronni

I found out at my first visit that my blood type is A negative. I had to get a Rhogam shot because they didn’t know for sure what my husband is and I was having spotting (this was early on). I was told I will have to get another one at 28 weeks. At my husbands physical he got his blood type checked and we found out he is also A negative! Does this mean I won’t have another Rhogam shot? I really would rather not get another one if I don’t have to.