Sir,I had unprotected sex with my girlfriend in 4/Apr/2017 and it is time to get the period from 13 to 16th in the middle of every month but she is not getting her period now and sometime it seems as her period will come but it does not come, She tells me that after eating the food, my stomach ache starts, what can be the reason,i think she has been pregnant,if she is pregnant please suggest me how can i stop the pregnancy with the help of pills.