Am I pregnant or not


I don't even know where to start I have done about 15 pregnancy test and of the 15 3 were positive with very faint lines all at random times... I had given up hope for this month and convinced myself that I am not pregnant but since yesterday I have been feeling slight cramps in my lower abdomen and back, nausea but no vomitting,, and this bad Taste in my mouth just never seem to go away... I had what I thought was implantation bleeding on February 22 for 3 days.... I would be 5 weeks now if it is that I am indeed pregnant... Took another test this morning and still negative... And I am feeling so sick like I am pregnant I don't know what else to think