It's possible that you may be pregnant, but you shoulld confirm with a doctor. Sometimes a very faint line on a home pregnancy test can indicate early pregnancy, but it's best to have a medical professional confirm the results with a blood test or a more sensitive pregnancy test. Additionally, there can be other reasons why you're experiencing nausea and dizziness, so discuss your symptoms with your doctor.

If you think the symptoms are of pregnancy then you can take a home pregnancy test to confirm, or do a urine pregnancy test.

Taking emergency contraceptive pill after unprotected sex may lead to the changes in the menstrual cycle including irregular bleeding. Yet, bleeding within a week of taking an i-pill could also be a sign of hormonal imbalance or other medical conditions. However, the best option is a detailed examination and treatment by a gynecologist.
 

External hemorrhoids or piles can occur during or after pregnancy due to the increased pressure on the rectal veins and hormonal changes. Hemorrhoids often improve with time and self-care measures such as a high-fiber diet, hydration, and creams. 

usually it's a simple procedure with slight discomfort.

The probability of pregnancy from the situation you described was quite low because you took the necessary measures after the unprotected encounter. Although light bleeding might have been caused by the pill's side effects, like irregular bleeding, this is not a sign of pregnancy. This idolizes the truth that hormonal changes can cause such and such. It is common and does not mean you are pregnant. If you're worried, taking a pregnancy test can provide reassurance. 

It's normal to receive a negative result on an hCG blood test right after the missed period. Sometimes, the test can't detect pregnancy because it's too early. Therefore, if you still experience symptoms such as nausea and breast tenderness, you can retest a week later. However, it is also important to be calm and patient. If you're still confused, getting a second opinion is a good idea.

It is not recommended that a person take multiple medications together without consulting a doctor as it can lead to interactions and unwanted effects. It is advisable to consult a gynecologist in order to obtain the relevant medical care you need. A gynecologist may tell you about the right choices of contraceptive methods as well as the possible side effects.