A week late!

Was suppose to have my period last Monday, have yet to come on. All I have is frequent trips to the bathroom thinking I came on, when there's no blood in sight. There is discharge tho..what could it be? My cycles are normally anywhere from 21-22 days apart...it's now going on 30 days. I took a pregnancy test last Saturday and it was negative (a dollar store one)..has any of this happened to anyone else! I've been ttc for two years, and I'm hoping this is if. I had camping like I was about to come on, and nothing ever came out. #fingerscrossed #ihopethisisit when should I test again?