So terrified about miscarriage

So back in july i had a miscarriage.. It was crazy. I got pregnant, tested after 4 days of missed period and received a positive. I took multiple tests and they kept getting faint. I was a bit confused but not till i had a weird pain on my side and diarrhea did I finally freak out and go to the hospital. When i got there they told me I was having a miscarriage and they were sorry. Well im pregnant once again and im 4 weeks and 4 days. Im freaking myself out though. I had diarrhea today and any little pain i get it get scared.. I took two tests today that were a bit faint but not bad. Im just so nervous this time. I want a healthy baby and pregnancy. Im going to give it a few more days and test again and make sure my tests continue to darken.