how long should i wait after methotrexate???

ok i just got my shot like 2 weeks ago and well since me and my husband havent had sex in a while because of the bleeding well we were a lil tipsy yesterday and we had sex without protection and well i stoped bleeding for like 2 days now so idk whats ganna happen now i read that its bad to get pregnant with methotrexate in your system still like id have to wait 3 months min so im worried now any suggest?