Spotting but not.. halppp

To start, I've already contacted OB who isn't worried as I've already had several bloods drawn and levels were increasing wonderfully, but she's bringing me in for more bloods & then hopefully an U/S.

Just looking for anyone who may have experienced this!.. I'm 6+1 and when I wake up in the morning & pee for the first time or after I have a bowel movement there's the faintest hit of pinkish/tan to my urine when I wipe. No actual blood & probably wouldn't even notice if I wasn't paranoid from a miscarriage last year, but still, it's happened 3 mornings now. And then that's it. I'm not having any bad cramps or anything. Just curious about what the heck could cause it.