Make sure you're really hydrated, that can sometimes cause spotting- I went through that myself- but if you're really feeling freaked out, try calling your Dr's after-hours line, sometimes it helps just to hear it from your Dr office that everything is normal. :)
I had some pink and it went away. Later I had actual bleeding from implantation and with rest that solved itself too. Now at 37 weeks and all is well. It's very likely you'll be just fine.