Why Am I Not Getting Periods for a Month Despite Negative HCG Test?

I advise you to go to a gynecologist immediately. Rashes in vaginal area can be a sign of a vaginal infection or a sexually transmitted infection.
 

It’s completely normal to feel anxious about this. When you don't get your period after having unprotected sex, it’s usually a cause for concern. Stress, hormonal imbalance, or pregnancy could be delaying it. Also, the fact that you took an emergency contraceptive might mess up your cycle. Just give it some time and you may see your menstrual flow soon. However, if there are other unusual symptoms or the delay persists consider taking a pregnancy test.

Fee­ling anxious is understandable. Sometime­s stress impacts your menstrual cycle, causing de­lays or irregularities. If you haven't e­xperienced pre­gnancy indicators and it's only been a fortnight since unprote­cted intimacy, detecting pre­gnancy might be premature. 

Toward the middle of the pregnancy, a smaller belly at 17 weeks might trouble you. If a belly is small, it can be because of the baby’s position, the way your body is holding the baby, or many other reasons. In the majority of cases, it's not a big deal when your health conditions are within normal limits. Continue to eat well and go to all of your pregnancy medical check-ins to ensure that you and your baby are healthy.

A pelvic lump is a surgical emergency, and you should not wait to visit a healthcare provider for appropriate medical examination. These kinds of masses may be caused by different conditions such as an ovarian cyst, uterus nodular formation or even cancer. I suggest that you seek medical advice from an OB/GYN doctor for further examination, and treatment if necessary.

In some cases, surgery may not be necessarily required and your doctor shall determine the severity of the case and recommend treatment. This is why, it requires professional medical intervention to avoid further complications.