My RE just called me back. She said that she was not worried based on my last bloodwork and my u/s and our conversation.
She did point out that with the progesterone suppositories (I take one in AM and one in PM), don't insert too far. Many women hit the cervix, and that will cause spotting / irritation / and some bleeding. This is probably common sense, but something I never thought about....so hopefully it will help someone else too.
I feel much better. Going to try to take it easy tonight and take a deep breath. I see a cup of decaf tea in my future :-)