Pregnancy Symptoms Questions

After taking the high hormonal emergency pill like I pill one gets withdrawal bleeding 5 to 10 days later, and then a new cycle starts. This means no pregnancy and that is what has happened in your case too.
Any doubt may get blood test done serum hcg-beta.

I am sorry to hear about your concern but will be happy to assist you.
Breasts grow in response to the hormones estrogen and progesterone. As you enter puberty, levels of these hormones increase. Your breasts begin to grow under the stimulation of these hormones. Hormone levels also change during the menstrual cycle, pregnancy, breastfeeding.
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From your description - practically no chance of pregnancy.
If any doubt get blood test done serum hcg-beta.

Hello, this is likely the withdrawal bleed as expected post unwanted 72 intake, however to be doubly sure you may get a pregnancy test done.

Well this can be as you have done unprotected sex during ovulation period, wait for your next period date if you missed the period then after 7 days of your expected date go for test.

If your last period was 12 th sept with past regular 28 days cycle then on 12 november you will complete 2 months.

I am sorry to hear about your concern but will be happy to assist you.
Sometimes a woman will have spotting and think her period is about to start and not see any more bleeding. This can be implantation bleeding, which is the earliest sign of pregnancy, that is sometimes mistaken for a menstrual cycle. It can also be that your period simply is lighter that month.
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No.
After stopping duphastone one normally will get withdrawal bleeding within 7 days if there is no pregnancy,

When ovulation happens- release of ovum from ovary, due to hormonal changes some may get bleeding which is called ovulation bleeding.
After sperm and ovum unite when xygote gets imbedded in inner lining of uterus it is called implantation bleeding.
Only theortitical knowledge- not of practical value.

I am sorry to hear about your concern but will be happy to assist you.
The simple answer is yes, you could still be pregnant even with a negative test, depending on when you took it, but there are also other reasons your period could be late. A pregnancy test detects hcg levels in your urine which increase the longer you are pregnant.
Let's connect over a call so that we can discuss your concern in details and make a suitable treatment plan for you.