¿Por qué tengo burbujas cerca de mi útero?

Based on the information provided, there is a possibility of PREGANANCY.. Get a pregnancy test done.. If positive, consult a doctor for advice on abortion.. Taking pills without a doctor's advice can be harmful...

Occasionally, periods can be a bit of light bleeding which can be mistaken for an early pregnancy. In addition to that, there are also symptoms like nausea, breast tenderness, and fatigue that can be a sign of pregnancy. Nonetheless, having a period is not a definitive indication that you are not pregnant. If you're worried, taking a pregnancy test is a good idea to make sure.

IT'S POSSIBLE TO GET A FALSE NEGATIVE Wait a few days.. STRESS and weight changes can cause late periods.. Remember to TAKE YOUR TIME and READ THE INSTRUCTIONS carefully when taking a pregnancy test. It's important to BE PATIENT and WAIT FOR THE CORRECT TIMEFRAME for accurate results.

A decrease in semen volume after sex, can happen due to factors like frequency of ejaculation, hydration, age, medications, or other health conditions. 

Experiencing a missed period, back pain, leg pain, and vaginal pain could indicate various underlying causes. Consult with a hyour doctor for an accurate diagnosis and appropriate treatment. 

The pill is good at preventing pregnancy, but it's not 100 % effective. If you're going to get your period in 2 days, the chances for you to get pregnant are lower now, still, it is a small chance. If there is any worry, you can do a pregnancy test after your period to make sure you're not pregnant. 

You look like you might be afflicted with a serious case of menstrual cycle cramps that can, in some cases, lead to constipation and nausea. Stress, as well as physical pain, can lead to a fainting spell. This pain, as well as stress, can't be relieved by following these symptoms. The symptoms can be reduced by keeping your body hydrated, eating food high in fiber, and using pain relievers similar to ibuprofen. What you want to do on your end is to get a proper consultation with the gynecologist to learn about alternative reasons and treatments. 

It's quite natural for some mild spotting to occur after intercourse, especially towards the end of your cycle. The dark brown spotting you got could be some of the blood from earlier times coming out. It is nothing to worry about, and it sometimes occurs when your body is getting used to the birth control pill. It will probably pass away by itself in a little while.