Just found out

We just found out earlier this week that I'm pregnant. Today I would be 4 weeks. Missed period would be today or tomorrow maybe? I have a drs appt on Tuesday, but I'm getting a little nervous about my hpt! I feel like the line isn't getting too much darker. What do you guys think? I've tested twice a day for the last 4 days. Its def darker than the first one, maybe its just me being crazy though. Do I have to wait till later on to see a much darker line? I got my first bfp at 10 dpo with afternoon urine. Today is 13 dpo, but I unfortunately didn't get fmu. What do you guys think?