Bleeding

So my bf fingered me and I was also supposed to start my period today and now I’m bleeding and idk which one cause it. I don’t usually get cramps from my period so I wouldn’t be able to tell. I think it was my bf cause when I went to use the bathroom it burned, like I had a cut or something. Should I go to the doctor? This is the first time I start getting to be more sexually active so I don’t know much