Pregnant?

So lately my boobs have been so sore & I have to ask my husband to gently message them at times. My nipples are sensitive and they stay hard all the time it feels like. They even poke out of my shirts when I wear a sports bra. It's been 7 DPO and I still have 7 days till my period starts... My back hurts and I get occasional cramps and nausea sometimes.. My boob is growing it feels like.. This never happens. Could it be in pregnant?