Last Friday I took several pregnancy tests, all faint but they came back positive

Saturday I got nothing then I waited a few days and I got a couple more faint positive tests

Then this morning I got AF and I took a pregnancy test yesterday and last night and then again this morning and they all have faint lines.

I have had a couple days of nausea,odd cramps not related to af and dizzy off and on.

So I made a Drs APPT and went today, they did a urine and it came back negative

Has this happened to anyone else and if so what was the outcome??

Any advice would help ease my mind!!