Hi My Period Are Regular I Had My Period On

Hi my period are regular I had my period on the 1st of may 2015 I was due on the 29th of may 2015 I didn't get them I did a HTC test came back negative I had light bleeding like a period on the 22nd of June 2015 for 4 days could I be pregnant If it was a period on 22nd of June I should of had my period this month but nothink