Common to get positive and negative ??

Em

Hi all

I’ve been TTC for 5 years with my husband. I had a blighted ovum in 2018 and haven’t had any other positives since then. I’m feeling a bit under the weather so I took a Covid test and joked I should take a pregnancy test bc I’m 4 days out. It came up positive (digital)

I wanted to confirm (and totally didn’t keep any urine from before so had to try to pee again) but the second came negative

Is this common? Maybe not enough HCG in the second time? I’m so excited but my heart is also guarded out of fear of a false positive….