miscarriage or too much activity?

Sarah • Married. Beautiful baby girl July 2016. Miscarriage October 2017. TTC again.

we were honey mooning in TN and we did rock city and ruby falls and all around gatlinburg in 2 days. my body isn't use to me walking around so much let alone climbing around in rock city. hospital in TN was useless. pretty much said she's calling it a threatened miscarriage. as in it might happen but might not. the hospital had no equipment to check anything except my cervix, which she said looked closed but was bleeding a bit. called my ob when we got back home. they ordered blood tests to be done and then again in 48 hours and then I have an app for Monday. blood is brown on my pad but red when I wipe. sometimes brown when I wipe. sometimes nothing at all. im confused and hurt. we kept this pregnancy a secret and announced it at our wedding at 9 weeks pregnant. And the day I posted our sneak peaks from our photographer of our announcement, I stated spotting. this can't be happening, right?