What can diarrhoea mean?

Had it just now. It’s not super runny but very loose. This as well as tingling breasts, low back pain and nausea have all been NEW symptoms for me. I’ve NEVER had this before especially before my period. I’m 12dpo and period is expected in 3 days. I tested this morning and thought I could see a vvfl but I might test in the morning again with a first response as I discovered clear blue can give false positives. Can this stool mean anything? I’ve had a sick feeling in my stomach the last few days but I don’t need to physically vomit. Something just feels different with all these new symptoms. Insight please!