Hi, Tifany and welcome!
What an exciting time! : )
If your girl seems to be nesting, that's great and a sign of impending labor; however, spotting is not normal before labor begins, so it would be best if you contacted your veterinarian asap, and/or bring her in, now. The spotting could be related to an emergency health situation, so you don't want to wait any longer to bring her in to be seen.
When she's in actual labor, you may see some slight bloody vaginal discharge along with the contractions, and that is normal.
I hope all will be well with your kitty and her litter!
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