14 months trying to concieve

Hello I’m 23 trying for my second child, been 14 long months and nothing apart from a chemical pregnancy In may, my partner thinks it’s because I smoke weed every now and then mostly for my anxiety and depression and my dad passed away last year so it helps me cope with it, is this the reason I’m not getting pregnant? obviously when I was pregnant with my son I stopped smoking it straight away and I stopped when I found out I was pregnant with my chemical? any advice would be great, thank you x