Im so worried please help!

So I have been diagnosed with pcos and finally I'm pregnant with my second child after quite a few miscarriages.. I have a 13 year old as well..well the problem is I don't feel pregnant but I am having symptoms that seem very weird and nothing like my last pregnancy..I'm eating alot I know that's normal...I'm peeing alot I know that's normal...I'm Moody and I know that's normal...but I'm not nauseated at all...I feel like I have the flu with all the the mucous coughing sneezing sweating and all..and now I see my heart beating and I can hear it..it feels like it's beating harder not really faster...so now I'm starting to panic and I feel a anxiety attack coming on...I am 31 years old and only 5 weeks and 5 days pregnant I thought I was 6w 4d... I had a ultrasound yesterday but they only saw the yolk sac...can I please get any advice or words of wisdom thanks alot!!!