AM I PREGNANT PLEASE HELP ?

ok so iam a week late for my period but my periods have been messed up since january i have been coming on every 2 weeks.. anyway i am getting really bad headaches and dizznes sickness also the area around my nipples are sore my belly really hurts lastly i have had really dark urine and very tired.. i have took tests but they have been negative i took a test today and when i opened it up it have a very very faint red line unless it was my eyes imagining it. do you think im pregnant or am i just wishful thinkin ???