About 5 weeks pregnant (possible miscarriage)

Amanda
Hey everyone! I found out I was pregnant on Monday March 13th the doctor did a blood test. My hcg levels were at 58. I have been having cramping so she did another blood test on March 15th and it was 81 miu. Today I have period type cramps and o am bleeding dark brown and having period type cramps. They did send me for an ultrasound on the 15th but couldn't see anything. That day i was having a sharp middle pain. So today I have been spotting brown and a couple red spots. I have a blood test again tomorrow but I am freaking out so much. My husband and I have been trying for 2 years and finally got the positive. Any advice?