last month around 18th me and my bf were fooling around,he masturbated then with his hand n then wiped his hand with a tissue,afterwards we slept together in a blanket for half n hour,he touched the blanket meanwhile and then after that we started again and fingered me,my question is could i get pregnant due to the traces of sperm left on his hand or could the sperm was removed?pls help,m worried and yeah i got my periods last month after 8 days of doing all this and there were lots of cramps and weakness and heavy flow but this month my priods is late,and yeah my periods are irregular