I have pcod in past .after walking and reducing weight i have my periods regular . but now i missed my one period and last period was on 16 july 2023 .my age is 19 and i have intercourse with my partner and i use plan b recently to avoid pregnancy ?

First of all, if you are having intercourse you should be more proactive and take regular birth control. Please see a doctor or a clinic for that. Once you take plan B, your cycles can be disrupted. Best to get a pregnancy test and pursue regular birth control as advised. You may be asked to do a blood pregnancy test to really ensure you are not pregnant and then start birth control pills asap.