YOU SAID:

I pooped into my hand for a fortnight

INTO JAPANESE

私は2週間、手にうんちをした

BACK INTO ENGLISH

I pooped on my hands for two weeks

INTO JAPANESE

私は2週間手にうんちをしました

BACK INTO ENGLISH

i pooped on my hands for 2 weeks

INTO JAPANESE

私は2週間私の手にうんちをしました

BACK INTO ENGLISH

i pooped on my hands for 2 weeks