Is Heavy Vaginal Bleeding Normal After Taking Plan B?

okay. so my boyfriend and i use condoms but there has been a couple times where he has went inside me for a few minutes without one. he didn t do anything to be worried about but as a precaution, I took plan b on September 9th. That weekend (12th), I felt really sick, tired, and had bad cramps. (note: i get cysts every month and that hurts but it hurt worse) I then got a four day long period a week later, the 16th through the 19th. i believe it was pretty light. it then stopped. i got my period a couple days over two weeks later, October 2nd. t started off extremely heavy. on Saturday I went though five tampons, two being super absorptant. it then decreased. my cramps were so bad by this point. after that I ve had light bleeding, brown blood that usually comes near the end of my cycle, and pink blood when i wipe. i will barely have any blood all day until i take a shower. when i get out it comes back. i don t know what s happening or if anything is wrong. I ve read things and some of it is scary like if you re pregnant or about miscarriage and i really don t want either. i just don t know what to do.