By 8dpo it could still be early, as I heard average for implantation isn't until like 8/9 dpo.
I obsess over symptoms all the time and every cycle it seems like I have new symptoms that I've never had in the TWW before. Annoyingly last month some of my sure-signs that I'd only ever had during pregnancy before, were cropping up in my TWW last cycle. I do think perhaps I had a chemical as I had a super faint line on 8dpo and my chart went triphasic at the same time, but even so, it's so annoying that I can seemingly get any and all symptoms during the TWW and they are both signs of AF and pregnancy for me!!
Signs I'm getting so far at 7dpo - tender breasts, tender armpit area, blue veins on chest and cramps on both sides were ovaries are (hoping this means ovulating from both sides, but I doubt it, just my secret wish for twins peeping through there!). I also feel absolutely boiling all the time, but like last cycle, that doesn't mean anything. Neither do my other symptoms really. I feel relatively hopeful, but then at the same time, fully expecting period to arrive by next weekend!
I do like how my chart is looking though. Looks like it may be going triphasic again - not that that guarantees pregnancy, it's just slightly more likely if you're pregnant. Fingers crossed!