i've never heard of dry sex before. but if you had clothes on the chances of you getting preganant are slim to none. i ocassionly get pains when im not on my period to on my sides or around my stomach. but they never last long. there just like quick sharp pains. and the cramps thing. most of the time your period is a little different than the one before. rather it be a little lighter or heavyier. so i wouldnt really worry about it. if it bothers you just go see your doctor.