OP, its really hard. I had a dear friend who was due just 5 days after I was. We planned our pgs together, it was glorious, until I m/c'd. Her pg continued and I found it really difficult to be around her. Then I was pg again and so it got a tiny bit easier to see her again, but I ended up m/cing that one too, and TBH it then became impossible to be around her. She was so kind and lovely to me and was always quite sensitive to my my feelings, but I was in such a bad place emotionally that everytime I saw her I would burst into tears, quite unintentionally. It was the hurt, the bitterness and sadness from m/cing a second time while she was still pg that was just too much to take.

So to answer your question, I understand how you feel, and it will probably be difficult to be around her and I think you should tell her because she is much more likely to be understanding and sensitive around you if she knows how you feel. My friend gave me the space I needed once she understood how bad I was.