BFP after 4 years TCC I'm so scared!

Hi guys, I've been trying to conceive over 4 years. I have had a failed IVF, I got pregnant in December withy the help of chlomid but ended in a miscarriage at 5 1/2 weeks. Just found out I'm pregnancy again. NATRUALLY! It feels amazing I managed to do it on my own but now I'm freaking out at every slight twinge thinking I'll lose it again! Analysing every line on the pregnancy tests to see if there darker! I'm gonna drive myself mad over the next few weeks. How can I relax? Anyone else feel the same? Is this normal to feel this way?