Help me put my mind at ease!

I have gone through 4 miscarriages in the past year. This is my 5th pregnancy (we just found out). According to the app I was supposed to start my period 3 days ago. I am approximately 4weeks 5 days (according to the app). I noticed a small amount of brown spotting type of blood on my underwear. Did anyone have any spotting or something similar to this? I'm freaking out and nervous. I have a dr appt tomorrow. Some feeling of stretching and cramping soreness but nothing painful like previously. I'm hoping this one sticks. 🙏🏻 pic of what is on my underwear.