First period...?

When you got your first period while breastfeeding was it different? I've had some pink spotting today and I'm not sure if it's my period coming or I'm a little paranoid it could be implantation bleeding. I'm 6.5 weeks pp, and my SO and I had sex a little over a week ago and were stupid about things and he's not confident that he pulled out in time (I know so irresponsible 😖) So any thoughts or experiences would be appreciated!