Light Brown CM - TMI

My husband and I have been trying for our first for over a year. We just went on our two year anniversary trip during my fertile window and I'm praying this is our month to conceive! 
I've been experiencing cramping along with this light brown mucous for the past 3 days when I wipe. I have seen similar mucous right before my period in the past, but it's never lasted this long. 
Does anyone have any thoughts? I'm a little excited to be experiencing something different, but also nervous because we vacationed in the Grand Cayman and I lived in a bathing suite while we were there (hopefully I didnt pick something up)!
Here's my cycle, my period is expected on the first of September: