yeast infection and a light period

[lenamisic1]

I will try to give as much details I can. i am 20 years old. Usually my periods were heavy and painful. When I had an intercourse for the first time it was very painful, and I was literally traumatized and didn't want to involve in such "activities" anymore until July this year. After having an intercourse again everything was normal and the last time I had it was at the end of July. Maybe two weeks after, I have experienced strong pain in my pelvis, bottom area of stomach, anus. I couldn't move for half an hour and then it stopped and never repeated again. I got two or three of my periods and they were normal and heavy. But, during all this time from the mid of August until now I am experiencing an yeast infection, it doesn't have a bad small just kind of cheese like secret. I have used the creams, it stops and then it returns back. Anyway, the last three periods have changed a lot. There is very little blood, I have just slight pains 2-3 hours the first day and then I am okay. Today is the fifth "period" since my intercourse but I am not sure if I can even call it like that. I am freaking out :( I doubt that there is a possibility that I am pregnant, but still, my almost non-existent periods are scarring me? Could I be pregnant? Or is it yeast infection causing this? Or maybe the first sexual activities changed my periods? Help, because I can't visit my doctor until the next month :(

[lenamisic1]

I have to add that we used condom every time, he did ejaculated while he was inside but I didn't notice that it broke