THC is stilllllll in my system!

I haven’t smoked since Dec after finding out I was pregnant. I was a avid smoking, I smoked at least 4 blunts a day. I haven’t smoked at all and wanted to take a drug test to make sure everything was out of my system and it came back positive for THC. I thought 30 days would do it but apparently not. Any other ladies out there take a while for your system to be clean? I just don’t want it to interfere with anything and my doctor to think that I’m still smoking and try to preach to me. Just seeing how long it took for other daily smokers to get clean