Is this normal?????!!?!?

Okay I had sex a few weeks ago, yea yea ik, but the question is, well my nipples...they are turning purplish a little bit it's weird it's like in one spot almost a wide straight line going right to the tip of my that normal?? Is that a sign of pregnancy?? Like what's going on they are just gradually getting darker in one spot and the tip of my

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