Hi, I Have Been Feeling Under Thhe Weather Lately Like

hi, I have been feeling under thhe weather lately like having nausea, frequent headaches, longer sleep, aversion with food that i used to like. Sometimes I can't even go out and stand for a long period of time. I get exhausted easily. I've tried pt for three times and showed negative. I don't know if it's too early. I've had spotting and then heavy bleeding the next day that last for three days. Am i pregnant? i get the feeling that I am but i just can't ignore the negative pt tests.