Cannabis and pregnancy

Hello please no negative comments I'm just wanting the best.

I suffer with ptsd, depression and anxiety and have self medicated cannabis for the last 7 years. I smoke it daily and do not get in any way 'stoned' effects as my tolerance is so high. I feel 'NORMAL'.

My worry is I have found out I am pregnant and want to stop. But what is the best way.

As the level of thc in my blood is normal for me, (and conceved when smoking) I'm worried that if I go cold turkey it will be to much of a shock to the baby. And may loose them. Or if I cut back and quit will that be too late and effect there development of my baby.

I really just want to do the best thing. X