never having sex no more

So i been having unprotected sex with my bf... im not in birth control and i dont want to bc then imma forget my pill and i just dont want babies lol.. and when we hav unprotected sex we by the plan b pill.. and every time i take it i have really bad cramps like these cramps male my cry literally .. i dont know what to do i took pills for this.. and it would not calm down... im covered in warm blankets and nothing