When does risk of cp end?

I'm really worried about my pregnancy after 2 chemicals in the last 5 months. Do you know when does risk of chemicals end? How many days after af was expected? Also, I got a very dark line when I tested the day af was due, does it prevent risk of chemicals? In my previous cases I never got an obvious positive (just vfl). Thank you so much, I'm very worried and I have to wait until lunedì to see the dr for the first time.