I am 4-5 weeks pg and experiencing some light spotting. Called the doc and she said it's no big deal if the spotting is brownish (vs. red). I am still nervous though. IT's been 2 days. Anyone btdt?

Yes. With both pregnancies. Totally normal. It's old blood. It can last for days. Mine lasted until 14 weeks on and off. Trust your doctor. It is absolutely fine. Stressing about it is the worst thing you can do.