Hello I Have Recently Been Experiencing Flu Like Symptoms And

Hello I have recently been experiencing flu like symptoms and extreme nausea and fatigue most of the day. I don't feel good at all. I have been hungry but when I eat I feel sick and stop eating. I haven't had any breast problems or vomiting. I have been with my boyfriend for 9 months and always had unprotected sex. (Bad idea) I took a HPT an hour ago and it came back "not pregnant " but I feel I just did the test wrong. I didn't take it early in the morning and I didn't pee on the stick 5 seconds. I did it, took it out and did it again. Big mistake. I have irregular periods so I cannot tell when my period was suppose to start or when I ovulate. I haven't had a period in 2 months. So could I still be pregnant or maybe its just stress???