Am i pregnant, if not, whats going on with my body?

so my boyfriend and i tried the at home injection with the sperm. about 2 weeks later, my boobs got so sore that i couldnt even wear a bra. its been about a month, and they are still like that. ive taken 4 tests. 2 said faintly yes and the other 2 said no. everyother one gave a different answer. then i started having really bad cramping and then started spotting. out of no where i started bleeding so bad that i went threw a tampon every 2 hours. my period is never like that and never have cramping. ive read stories about people who have had pregnancys like that where they have heavy bleeding instead of light spotting. i dont wanna get told to go to the doctor or to take another test. i am going to go to the doctoe and take another test yes, i just want to know what other people think. has anyone else having the same thing happening to them?