TTC after MC and partner smokes weed

I had a MC in December and have started wondering if my partner’s weed consumption could have influenced it. He smokes only a little bit but every night (about 2 joints per week in total). It does not bother me as he is very healthy otherwise, doesn’t drink and has a great job. I got pregnant after only one month of trying before my MC so it doesn’t seem to affect his sperm count but could it be affecting its quality? Should I ask him to stop? I don’t want to be the nagging GF especially since his consumption does not negatively affect his life and is under control. Advice appreciated. Thanks!