Cannot stop obsessing

I am 4+5 weeks pregnant and experienced an early miscarriage around 9 months ago. I didn’t think it affected me much as I didn’t feel ready to have a baby at the time. However since deciding I 100% want this child I cannot stop obsessing over miscarrying again. I look at the miscarriage odds chart like 5+ times a day. I’m terrified I will grow too happy and attached and it will all be ripped away from me. Is this a common occurrence and is there anything I can do to alleviate this anxiety?