Scared for my pregnancy

I'm worried that my hcg is only 21 for my beta levels I'm unsure how far along I am cuz I haven't been able to get into the doctor's since they have been booked out so far so I'm waiting but I'm stressing out cuz I'm worried it won't be a viable pregnnacy maybe I'm just stressing idk but could use for advice and I can't calculate my possible due date cuz my cycle is anywhere from 30-65 days so my period was irregular unfortunately so idk what to think this will be my 5th pregnnacy I'm only 22 and stressed my last period was April 22nd.