Had unprotected sex at 1June (my period ended at 21May) , boyfriend did not ejaculate in me. Period came on 10June instead of 13June. Experienced light period for 4 days. If I put a pantyliner , it fills up 3/4 of it though The blood looks like my normal period with clots but its just light. 
Feeling paranoid , took a preggers test and came out NEGATIVE. I have no symptoms related to pregnancy except for farting all the time (sorry if TMI)
Am I pregnant?
Is that light bleeding or...implantation bleeding?