4 days late of period. Chance of being pregnant?

no and just remember that just because she started on the 29th doesnt mean she will keep having it on the 29th there are some months with 28 days some with 31 days relax sides she had pantys on as you say right ???? some woman only get it once a year some only get it 3 times a year some go irregular after intercourse relax but if i was her dad and i found out you would be talking out the side of your face so think next time cause you sound realy young when you have a kid you just cant say ok im done with it. you have it for life good luck