Why is my period irregular for 6 months?

You might have a disorder called menorrhagia, that is having heavy periods with clots. This problem may be due to hormonal imbalances or issues with the uterus. The heavy bleeding and clots you experienced may have caused some disturbances in your normal menstrual cycle. Consulting a doctor is essential for further evaluation and management. Treatments including hormonal therapy and procedures to deal with heavy bleeding can be the options that these doctors will mention to you.

There could be a delay in menstrual cycle because of many reasons like stress, hormonal problems and some medical conditions. Nevertheless, you had no protection thus pregnancy is always a possibility for you. A pregnancy test and a visit to the gynecologist will be necessary for proper evaluation. They help you in knowing what to do and also give medical advice.
 

If you have missed more than 24 hours of the change time that was determined for you, then your protection against pregnancy might not be optimal. It is therefore advisable to use an alternative contraceptive method for the next one week and immediately seek medical attention from your obstetrician-gynecologist. They can also tell you what to do further and ensure that you are still safe from pregnancy.

A woman could be pregnant if she gets a menstrual cycle after having sex for 11 days, but other times, this is not the reason behind it. You can see cramps in this regard or some bleeding that is not typical of a period. This may be due to the changes in your hormones, or there may be other issues that have lead to this. To diagnose the situation, it's advisable to take the pregnancy test a few weeks after the last time you had sex. Although it's not necessary to have periods after 11 days each month of the sexual act, it does occur sometimes, but it's not always indicative of pregnancy. 

Ge­tting pregnant has a very low chance he­re. Precum can sometime­s have sperm, but the risk is small without e­jaculation. Taking an emergency pill within 24 hours gre­atly lowers the chances of pre­gnancy. Watch for strange signs like missed pe­riods or feeling sick, but pregnancy is unlike­ly here.

Hormonal imbalances, stress, and other factors can contribute to irregular bleeding. To help regulate your menstrual cycle, focus on a balanced diet, exercise regularly, maintain a healthy weight, and manage stress.

Considering the beta hCG value of 0.30 mlU/mL from D-23 days to D +45, it is probable that vaginal bleeding recorded after day 17 following menstrual cycle must have emanated from implantation bleeding Nonetheless, a gynecologist should be consulted for further evaluation and confirmation.

BASED on your hCG level, YOU could be pregnant... However, the scan DIDN'T show anything yet... Your last period was on 16th October, so it's possible you're just a little over 2 weeks pregnant... You should wait a few more days and take another test... If it's positive, schedule an appointment with your doctor.