Confused! 😩 2 positives and 1 negative

So My period was suppose to come on Sunday. I took two pregnancy test yesterday morning and both came up with a faint line. Different brands and photos were taken after the correct amount of time. Today however in the afternoon I went to a clinic to confirm the pregnancy and the test came up negative. I’m so confused. How could I get two positive tests from two different brands one day and the next day have a negative. Is it false positives or is it because I took the clinic test in the afternoon and not morning. Ive had no bleeding at all. The photos attached are my very very faint line tests from yesterday. Let me know what you guys think about this whole thing.

****UPDATE**** 4/5

Tested again this morning and it came out positive and a little darker. So relieved! I must have just had diluted pee when I took the test at the doctors. I’ll be testing again on Monday with a dollar store test and a first response test and if they are much darker I’ll make a Drs appointment to officially confirm!