Brown spotting after sex

Erika 🌈 👧🏽 🤱🏽 2 ladies hold my 💕

I has sex with my husband on the 1st and 2nd and now have light brown spotting. I know light brown spotting is old blood but at what point and how much old blood should draw concern? I am going to be 40 in February. 1 miscarriage in 2012 and 1 full term rainbow baby in 2013 with no complications or spotting. I am scheduled to go to my first dr apt on Dec 13th.