Please help no sign yet!

Aunt flow is due today but so far i have no sign of her other than little to absolutely no discharge.. i am 10dpo (i took tests) and 11 days ago I got fingered by my boyfriend with potential precum on his hand.. however I know getting pregnant this was is highly unlikely. Could it have happened to me? I’m nervous. I took a cheap test yesterday and it was negative.. what to do!?!