Maybe pregnant?

So I’m very confused!! I’m pretty regular on my periods maybe I’ve been late by a day a few times in all my years of having a period. But I’m pretty regular for the most part! Well…I’m currently 14 days late today..I took 3 tests and all of them showed up positive with very faint lines. I went and got a blood test done and the nurse before she did anything after i showed her the tests I did was like “oh you are DEFINITELY pregnant” so of course I was very excited, this will be my first! Then the test came back negative? She said it could be too early..but idk. I don’t feel like I’m going to start at all. All of this is just confusing me!! I couldn’t get into my gyno til The beginning of August. Has this happened to anybody else??