Helping a Friend Cope with Loss

My close friend just took a positive pregnancy test this week and sadly lost it shortly after due to blighted ovum.  She and I had been bonding over me being pregnant and her trying to get pregnant and I now I feel terrible when people congratulate me or ask me about my pregnancy around her while she's grieving.  Any tips for how to support my friend during this horrible time for her?  She also has to wait at least a cycle to start trying again so I know that will be difficult as well.