Nausea and negative early test

My periods are very irregular. My hubby and I were safe at all last month and I think I ovulated early but not 100%. I have been soooooo nauseous and it is just getting worse! I’m not due for my period until the 10th. I took a test last night and it was super negative how accurate do you think that was if it was almost a week before I’m supposed to miss my period?