Hcgs doubling but Brown spotting?

I’m freaking myself out but I’m 4 weeks pregnant today by betas at 12dpo were 41 and at 14dpo they were 98... but today I have had brown spotting ... doctors told me to just keep an eye on it but it could possibly be an irritation from the progesterone vaginal supplements I’m taking... anyone had some spotting in early pregnancy & been fine?