No period, no sign of one, no sex! Dry humped fully dressed last month. Period came on time last month. Nothing this month I'm scared?

No sex- not pregnant. If there has been no sperm in vagina there is no possibility of pregnancy. This is scare due to guilt. Lack of period or delay of period is not uncommon and may be due to a large variety of issues. If you are concerned about pregnancy you could always check home pregnancy test.