5 days overdue, pregnancy symptoms, tests negative

Hi hi,
I've been trying to get pregnant for a year now. Unfortunately, without success. From about six months ago until a few months back, I got increasingly frustrated by the uncertainty and because your body can play tricks on you like that. Lately, I've been letting it go a bit more and had decided to just wait until the one-year mark (which is now) and then go to the GP.
But... Coincidence or not? I'm now 5-7 days late. I'm torn between these two days because normally my period would be due on March 31st, but my ovulation was on the 14th, which would put my period on the 29th. I'll assume it's 5 days late for now.
There's absolutely no sign of a period. No bleeding at all. Not even heavy white discharge. Besides that, I do have stomach ache (gurgling and cramps), bloating, gurgly bowels, sensitive breast (actually just one), tiredness, mild headache, and occasional nausea. Also, some things suddenly smell bad to me. My urine has also started to smell different for the past day. This could be because my sense of smell is stronger, or it could be a pregnancy symptom. This could very well indicate pregnancy, but also an upcoming (very late) period.
I've been testing every day since Sunday, and they've been negative so far. Now I have to say that I've tested every time in the afternoon. And it's possible there isn't enough hCG in my urine yet. It could also be that I'm not pregnant.
So still very unsure. And somewhere inside, I want to make a promise to myself to only test again at the beginning of next week, but I know myself. I already know I won't stick to that haha.
I'm still trying to convince myself that my period is just very late, but it's getting harder day by day.
Have you guys experienced this too? And what was the result for you?
Best!