My Menstural Cycle Is Between 31 To 32 Days. My

My menstural cycle is between 31 to 32 days. My last period is june 14th. I missed my period till now.it is 20 days late not get period. I checked urine test and beta hcg test shows negative. Finally i checked in ultra sound pelvis it shows not pregnant. But endometeric is 12mm thickened. Whether i get pregnant hereafter for thickened endometrium.pls give me a reply doctor