5 weeks and slowly rising hcg?

I just got my dye stealer, been testing since my first HCG test which was 335 on Tuesday of last week. My OB said it was too low cause she swore I was 5 weeks back then but the app had told me 4 weeks so she said my HCG was low when my results came and wants me to test again this Tuesday. She made me feel discouraged and nervous because of my ectopic pregnancy history. Has anyone had that HCG at 4-5 weeks ? Seems like it’s slowly going up according to the tests.