Given your symptoms, such as scanty bleeding and breast pain and tenderness before your period, there is a possibility that conception may have occurred even though your period has occurred. However, it is difficult to give a specific answer based on such a short description.

To be sure, it is recommended to take a pregnancy test. A pregnancy test is best done after your period has been delayed for more accurate results.

If you have doubts about this situation, it is always worth consulting a doctor who can provide more personalized advice. If you are not able to make a face-to-face visit, I attach a link to the online teleconsultation:

https://www.gdziepolek.pl/telekonsultacja/z-ginekologiem

I encourage you to read additional materials that may be useful:

https://www.gdziepolek.pl/artykuly/test-ciazowy-jaki-wybrac-i-kiedy-zrobic