Pregnant after 5 years of trying

Shay
8/26/15 night I found out I was pregnant after trying to conceive for 5 years... Went to the ER and my hcg was 149.8 they are not sure how far I am because they couldn't see anything on ultrasound. Went back to the ER 8/29/15 morning hcg went up to 219.8.. They diagnosed me as threatened miscarriage because of my blocked tunes and my hcg did not double... has anyone experience anything similar and had a successful pregnancy anything will help I'm freaking out?????? Thank you in advance