Weddingbee boards

so all my BM's have a b-day before the wedding and they are all always complaining how they have no money....so for their b-days I was going to buy them gift cards to get a mani/pedi to use for the wedding and we could all go together plus a lil something else for them to open on their b-day.  My MOH (my sis) I am going to pay for anyway her b-day is not before.  I asked one of them and she was really happy about it but I don't know what the others will think....I don't want it to look selfish or bad that I'm like ok Happy Birthday now use this for my wedding....I was just trying to give a gift that would be useful for in a couple months and I am also gifting something small on the side.  Plus I plan to buy their day of jewelry as well as a BM gift along with a cute tote.  Do you guys think this is ok?

ok good that makes me feel a lil better bc I will be giving one of them their gift tonight :)