Pregnancy?

I am 17 and sexually active with my boyfriend who I live with. The past couple days I’ve noticed my nipples are extremely sensitive in my breast feel swollen. I literally can’t even have my nipples touched or apply any bit of pressure on them without it hurting.I have had more gas than usual and I have been constipated as well. I am wondering if I should go and test now or should I wait till I miss my period. My period should be coming within the next week or so, but I am nervous and would like to find out as soon as possible if I am pregnant.