8DPO, i need advice..

So I need advice please… at 7/8DPO (my flo app says I’m 7dpo but I think I’m 8dpo) I tested and looked after couple of minutes and it was negative then I’ve looked this morning and there is a very faint line, it doesn’t look like an evaporation line. It looks like a very faint positive! I’ve been getting cramps, nausea, back pain, fatigue every day since about 3/4dpo and I was getting sore boobs up until today and that pain seems to have gone away. They are still a little sore but not as sore as they were. Is this a bad sign?? Should I test again tomorrow when I’m 9/10dpo or wait until when my period is due? Thanks in advance for all your help / advice🥰