Hi, I Am After Some Advice. I Found Out I

Hi, I am after some advice.
I found out I was pregnant about 3 weeks agI and had brownish bleeding from the start. My doctor referred me to the early pregnancy centre for testing. They did an internary scan which showed only an empty sac. They did some blood testing to test my hgc levels which were rising but not as they should. Shortly after this I started with bad cramping and the bleeding changed to red and got heavier. I then started passing very very small clots and my hgc levels had dropped to 60. The hospital then said I had had a misscarriage and no further treatment was nessassary without doing anymore scans or tests. Since then the bleeding has stopped but I have developed a pain in my left side of my pelvis which sends pain down my left leg. It almost feels like pressure on the pelvis/hip. I also have a very dull ache in my sholder and arm. The pregnancy was no more than 5 weeks when I had the bleed last week. Could your give me your advise please? I'm worried they have missed something