Mommies are experienced, advice needed))) Daughter is almost 3 months …

Mommies are experienced, advice needed))) Daughter is almost 3 months old. Always knew and felt that I could quickly get pregnant ? (mom too) And right after marriage, immediately after 2 months got pregnant, it turns out ? Now I'm thinking about planning only next year) How to prevent pregnancy?))? Besides pills and condoms and the diaphragm... Are there any other working schemes? We have PP now