Pregnancy Scare. To my parents for help.

Last month I took medicines to delay my period for around 7 days. I did engage in certain sexual activities during that time but I did not have sex.After that I got my period, but it was mostly clots and very less liquid. On 2nd July, I went to my boyfriend's place and we engaged in activities again. He had come once in the morning and again during the evening and had washed himself after that. Half an hour later, he just rubbed himself on me and he was not even hard. Two days ago I started developing a pain in my breasts. I am really scared so I took a pregnancy test today and it was negative. My period usually lasts for 5 days, and last month I had it on 23rd. Please help. I'm a young girl and afraid to go to my parents for help.