BM advice... need help! (little long)

I'm so torn and I feel really terrible. Just for a little back story... FH and I decided that we were only going to do a MOH and BM - no one else in the bridal party. So I had a VERYYYYYYY had time choising between my 2 best friends. I went with the one that I felt would take it harder if I didn't ask her. But now, I know my other best friend is upset (she hasn't said anything and never would she does understand!). I really want her to be in the bridal party the more I think about it. She is my oldest friend, we have been best friends for the past 15 years and I feel like I'm just leaving her out. FH's BM is my brother and FH doesn't have any other close enough friends he'd want in the BP. (When FH and I got prego his friends slowly slipped away bc he grew up and they DIDN'T!) Anyway... I don't want it to be like the whole BP is all MY people you know? or am I crazy?? FH said if thats what I really want its ok, but I know it upsets him he doesn't have anyone else close enough and I don't want to be rubbing it in his face. idk what to do I really don't want to upset FH in anyway but I also don't want my other best friend to feel left out. Also, is it like I waited too long?? I asked MOH in April. I'm so torn!!!!!!!!!