Could I really be pregnant after my first IUI?

It really doesn’t seem believable.  I took a pregnancy test 10 days after my IUI.  The test looked faintly positive.  I didn’t believe it.   I still don’t!  My partner told me that there is no such thing a slightly pregnant.  Very true.  However, I have a fear that this could just be a chemical pregnancy.  I’m really trying not to get my hopes up.  I was due to get my period 2 days ago…nothing.  Today I thought, maybe it’s just late.  But today is day 30, and I have a pretty predictable 28 day cycle.  Every time I go to the bathroom I expect to see my period.  And, each time I walk away in disbelief.  When will this really sink in.  I suppose after a pregnancy test at the doctor’s office confirms it I will give it some more credence.  Until then I will just continue trying to dismiss each “pregnancy sign” as merely a fluke.  I really wouldn’t want to be wrong.  It just seems too good to be true.  Could it really be true?!!!