TTC: implantation bleeding or PMS: AF?

Lo

Oh the dreaded TWW... This is my first time TTC, I have had 2 1/2 days of light brownish minimal discharge and almost a light pink type of discharge that doesn’t last the whole day, mainly appears in the morning. Yesterday was my worst day yet accompanied by severe constipation/diarrhea. Complete lower back pain on both sides which I’ve never had, and right lower ovarian type pain, which has been constant since I ovulated May 24. I have two different apps going, one app I’ve had for six years just monitoring the length of my period and my ovulation days so I trust that one. My ovulation day was May 24. My expected AF is between June 8 and the 11th. For the first time ever, over the last three days I had to wear a panty liner. Today the cramping is very very minimal almost gone and I’m not as dehydrated even though I’ve been drinking over 2.5 L of water daily. So I clearly have no idea what’s going on with my body either except to say that it doesn’t seem like normal PMS and I am praying that this may be a sign of implantation even though it is still too early to test and I have done so every day for the heck of it, and it has been BFN. I keep getting told if it is implantation I have to wait at least until the eighth to take a pregnancy test, maybe this is the same for you? Advice please, this is a tad anxiety provoking.