Could I Be pregnant?

Has anyone experienced this? I'm so confused. i have no idea how to count the dpo. Lately I have been experiencing very weird things such as feeling dizzy, nauseated, and headaches. I have been taking test since March 18, 24-27. In which those have came out with very faint lines, by very faint second line I mean faint like you have to squint to see the line. I would say I conceived March 6 or 7th. Every test i have took came out with the faint line, but some what getting darker. On March 30th i went to this free Clinic where they took a Pee test which came back negative, later that day i took a test which popped up with the faint positive line yet again. I have no idea what to do. I don't know if it's just me or it's getting darker.

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