I had sex April 5 , my period came April 16 lasted about 7 days , first three days of my period was heavy regular period flow with blood clots or 4 days was light w/ blood clots , so I know I couldn't be pregnant because implantionbleeding doesn't have blood clots right ?& normally my period doesn't start on the 16th but it did . But so on my period was suppose to start yesterday , had no sex the past few days , now I'm getting worried . Help please ?