Detoxing while pregnant?

So I’m 6 weeks pregnant and I was smoking weed daily until I found out. I haven’t scheduled a doctors appointment yet cause I already know they drug test at every appointment and I’m afraid of what happens when I fail. I need to get clean in like 2 or 3 weeks and I just don’t know how it’s gonna happen 😩 can anyone help?! I bought some stuff off amazon called Sonne’s no. 7 but now I’m reading that it’s been known to cause birth defects so I definitely can’t use that. Help please