hi everyone!

so im concerned about my gf. we had protected sex like about a week ago and recently shes been worrying about her period not coming, she told shes like 2 months late alreadt but she says her breasts have been hurting so i guessing its late or idk lol i doubt shes pregnant cuz the times we had sex i didnt even ejaculate. btw shes 17 and im 19 maybe her age can effect her irregualrity or it can be stress. any help would be appeciate it, thanks :)