Plus sized with secondary infertility

I have a 5 year old son and last April I lost my daughter at 5 months pregnant due to pprom I got pregnant with her super fast and now a year and 3 months later nothing I haven’t become pregnant I’m the same weight I was when I got pregnant with her and I don’t track my cycles hard core but I know around when I’m ovulating but Idk what I should do if I should go to a dr because it’s just not happening for me my husband does smoke wax(weed) frequently for medical reasons and I’m not sure if that’s having an effect but it’s taking a toll on me