I'm 5 2 days pregnant & my boyfriend & I had sex & right after I was bleeding bright red badly it was running down my leg, but I had no cramps at all then the next morning I was spotting brown discharge and this is the 2nd day I'm still spotting, I have lower back and stomach pains and sometimes when I burp my food feels like its about to come up, someone please help me I'm so scared .

Most likely it is due to the recent sex, but it would be wise to let your doctor or midwife know. They can check that all is well. It is possible that they may suggest you refrain from having sex until you are a bit further along in your pregnancy.

Call the doctor immediately. It is very likely that you are having a miscarriage. I had one and it started as spotting and then very heavy bleeding and cramping as you describe. Since it is early on, you will probably not notice if you pass the fetus.