chemical pregnancy again😢

Jess
Had one in September after 3 months of trying then just found out today I'm having another one my beta hcg is 18 and urine test is fainter positive today. What is going on?! Rang doctor up Friday to say I've got a positive test as he told me last time I need to be seen same day. Didn't sound interested so finally got into epau today and got hcg back straight away. Says I need to go back in 48 hrs but I know what's happening again😢