I hear that sore nipples are some sign of pregnancy, do they have to be both nipples, or it can be only one nipple because I have the right nipple only sore, and the left is not.

I'm having my period in time every month even since the last time I had sex which was 2 months ago, I got my normal period twice after that in time.

Is there a small chance that I could be pregnant and still having my period? Or it is impossible?

And if I'm pregnant, will the period be absent the first month only or the whole nine months?

Thank you very much :)
Angelina

Nipple soreness can be a symptom in early pregnancy, but it can also happen at different times of the month simply due to hormonal changes. There are also several medical conditions that may account for nipple pain as well as more simple reasons such as simple friction or irritation.
If you are having regular periods, odds are you are not pregnant. While some women will have some bleeding during pregnancy, it is not technically a period. Most women will find not having periods is the first symptom of pregnancy they have.
If it continues, or causes you concern, see your doctor about it.