really nervous right now...

went on a little walk and i noticed a slight cramping feeling. thought nothing of it. had to pee so i used the bathroom like normal but when i wiped a noticed a red tint and a slight discharge. called my doc and asked if maybe it may be my mucous plug and they told me it was too early for that. i have a doc app in the morning but I feel so nervous. this is my 2nd baby. anyone else go through this?