Anyone else?

So recently I have been feeling nauseous and extra tired and have just felt off so I decided to take a pregnancy test (I am on birth control,the patch) but the symptoms I have been having were the same I had with my first pregnancy…I took a test on Sunday and it was a faint line but positive so I called my doctor Monday (bc I had my birth control patch on) and asked what I needed to do…they told me to come in to get blood work done and I did and found out it was showing less than one….i always thought false positives were rare and don’t really happen….has this happened to anyone else?