Yea, It's okay, It's nothin' to worry about, It's caused by Increased melanocyte-stimulating hormone made by the placenta ( based off of Wikipedia). Some ladies will have darker ones then others and some don't even show. Mine didn't get really dark and noticeable until sometime around 30 weeks.
I have a really dark from my diaphragm to my pubic bone. My mom saw it and asked what it was cause she never had it with all her 4 kids. I hope it goes away cause my friend still have hers very visible and her son is already 4yo.
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