Pregnancy symptoms but… negative tests

Hey guys! today is the day I’m supposed to get my period so I tested this morning and it was undoubtedly negative but these past few days I’ve been having symptoms that are in no way usual during my cycle. I have had severe nausea without vomit (like I feel so bad that no matter where I am I have to slowly squat down or bring my knees to my chest which is unusual because I haven’t eaten anything out of the ordinary, I’m not sick, and I’ve never had nausea this severe as a “period symptom”), Ive had very bad diarrhea and flatulence, my breast are NOT sore which is odd because my breast become sore to the touch right before my period, and lastly there’s this smell. I don’t know what the smell is but there’s this savory smell in my house that no one else seems to notice and it’s driving me insane. I don’t believe it’s all in my head but is it possible to experience symptoms early on and get a negative test? Could a positive just come way later?