can i get pregnant

Im 15 and ive had my period for 2 years now but no one has really ever explained to me when i can get pregnant and when i cant. On the cyclescope can i get pregnant when the dot is purple and can i get pregnant on my period. Because i thought that you can only get pregnant during your period. Please no judging i never had it explained by anyone no other female figure in my family and schools dont explain this