Pregnancy tests


Is it ok that my pregnancy tests aren’t getting darker? 😕 it took 2 weeks after af was suppose to come before even getting a positive. I’ve been having some cramps here and there and had a lot of brown discharge yesterday and it’s very light today. My one concern is my dr had me get a abdominal/ pelvic cat scan done for other issues not knowing I was pregnant cause the blood test had came back negative and I got a positive 4 days later. I been nervous since seeing the brown spotting. I have my first OB appointment today but i dont know if they’ll do a ultrasound but I will be high risk