Grinding with 3 layers and fingering

do i get preg in this case? We did grinding with 3 layers and he ejaculated while doing it after that he fingered but its not literally in my vagina its on my undies only. Im currently 6 days late, im afraid that it had some sperm on my undies and it somehow gave some force while fingering me im always been regular and last month i just had a light period