I've Been Having Pregnancy Symptoms But Then Again I Had

I've been having pregnancy symptoms but then again I had my period on the 23rd of March( it came late n lasted 3 days and was light) n it normally last 4-5 days... Then it came again this month early(on the 14th) n lasted 3 days n it normally last 4-5 days.... I'm having back aches, itchy nipple, dizziness, weight gain, headache,feeln tired and sleeping a lot more, stomach feels sick(but I'm not throwing up) I took at home pregnancy tests n they came back negative... Then I took another first response n I got a very, very faint line (had to tilt it to see it) I took another one and got the same thing