30 yr old having trouble conceiving need advice

I have been trying for 4 months now with no luck (not long I know but I’m starting to worry). I’m vegan, I take vitamins and exercise. What am I missing? My husband is also a healthy eater and takes vitamins. We don’t have any medical issues.

We track my ovulation.

We are a very chill couple so there is no stress and we both sleep like babies.

I feel like we are doing everything right but I’m not sure what else can we do to get pregnant. I have tried herbal teas and sperm boosting lube. I’m open to more ideas. From grandma recipes to pharmaceuticals. Any tips?