Anyone else felt like this ?

I’m only 8DPO but since this morning I’ve had nausea, nothing too severe but my lower back is also hurting and I have cramps like AF is on her way. I have just noticed my knickers are wet, colourless and no obvious discharge. It’s like water. AF isn’t due until Sunday and I am normally regular as clockwork but perhaps she is going to make a very unwelcome early visit?! Has anyone ever had anything similar?