Is it too early to know?

Hi guys, so my fiancé and I have been together for three years and we never have protected sex not am I on birth control. I’ve recently started a weight loss journey and I’ve lost just ten pounds in two weeks. We have sex regularly. I haven’t had my period at all this month and just a week ago I started to experience some illness symptoms. I have a bad cough, coughing up mucous, vomiting everything I eat, overwhelmingly nauseous, and EXTREMELY sore nipples. My period was due to arrive on the 19th of April but I haven’t had any signs of it coming nor has it arrived. I’ve taken two different pregnancy tests and they’re both negative. Could this all just be from working out?, could it be to early to test positive for pregnancy? Please help

Thank you!