¿Por qué tengo irregularidades menstruales?

It is possible to prevent pregnancy by taking emergency contraception pills after having unprotected sex. These pills stop or delay the release of an egg from the ovary. However, they do not work all the time. This means that you can still get pregnant. if you have any symptoms such as unusual bleeding or missed period, it is advisable to take a pregnancy test just to be sure. 

A bad odor during periods can be a symptom of an infection. It could be bacterial vaginosis or an STI. Kindly go to a gynecologist for the right diagnosis and treatment.
 

Vaginal itching is a symptom that can be due to a number of causes, such as yeast infections, bacterial vaginosis and STIs. It is necessary to go to a gynecologist for a correct diagnosis and treatment. 
 

Not having your monthly period can be one of the side effects from Diane 35. But, in that case, we would rule out pregnancy as the reason. It is essential to talk with gynecologist and ask them about your condition's further guidance.
 

It's common TO have mixed feelings AFTER an abortion.. You're not alone.. Physical recovery can take a few weeks.. TAKE it easy, avoid sex, and limit exercise.. Expect bleeding AND cramping.. IF it's severe, see a doctor.. Emotionally, it's okay TO feel sadness or relief.. TALK TO a psychiatrist.

There is still a possibility of pregnancy even with protected intercourse. Menstrual cycles can also vary especially if you are undergoing stress, hormonal changes, or other factors that can influence your cycle. 

For medications need to understand your other health conditions. Please visit a gynecologist for proper treatment

Based on the information given, you seem to have cycles lasting 31 days. Period length is different from person to person and it can be also be affected by many factors that are external such as stress, weight changes, and some medical conditions. It is recommended to see a gynecologist if you have any problems with your mens cycles