HELP! Please answer!

Sara

I got a faint positive pregnancy test at 9dpo. Ive been testing using FMU and the test lines have been getting darker and darker. I tested this morning at 7am after going pee at 4am and the test is much lighter compared to yesterday’s test. I then took a digital with the same urine and it still says yes. Could this be because it’s second morning urine?? I’m freaking out that my hcg may be dropping. I’m calling my doctor this morning but just wondering if anyone has experience with this. I’m 13dpo today. Thanks.