im a little concerned..can someone help me?!

okay so on december 18th it was my first time with my boyfriend, we used protection both times we did it. He didn't ejaculate in me and the 2nd time we didn't finish (lol) after that i got both of my periods as normal. they were heavy. On march 10th i was supposed to get my period. i was sick that whole week and i was still sick after the 10th. well my period didn't come. It finally came on the 15th and it was heavy! its getting lighter now. and today i noticed a blue vein breast. i have never seen it before so i don't know what it has to deal with..? im 17 and someone told me it cause my breasts are still growing.Im also getting headaches a lot like when i get up from sitting..