Help please!

Ok so I believe that I am 4dpo and I have been having some pressure and super light cramps. Two days ago I had A LOT of cm and it was super stretchy and it was clear with a little white in it. My breasts are little swollen and occasionally they'll get sore and my nipples will get sensitive. I've been sleeping more than usual and I feel hungry all the time. Anyone else experience this before their bfp? If so what's the earliest you tested before getting a bfp? Please help, any advice/input is greatly appreciated.