Am i pregnat? or is this a funny period?

hi last month my period came may 13 and was very unusually light flow lasting 7 days(it was one week early) i was suppose to get my next period june 4 but it came june 7 which makes me three days late the flow was heavy with slimey clots...sry if tmi so it lasted for 4 days which isnt normal... my normal is 7 days i have also had pink spotting between both of them my next period is due june 28 am i pregnat?? i have taken hpt's between and after and befor periods and they were negitive. i am new to this so all opinions are welcome...thanks