CrAzY Nipples...beware TMI

Stephanie • 27; married; after 1 year TTC we got FAINT BFP 4/9.
So I always over analyze my body during TWW. But this month my nipples are crazy. The are tender AND itchy at the same time! Plus, they spontaneously get hard without any stimulation/tempo change. Just sitting at my desk working and all day they go hard, soft, hard, soft! And they ache! Am I in my own head or is this a preggo sign? BTW I am 7-8 DPO.