Should I see a doctor ?? Post iud

Abby

I had the mirena iud it just kinda fell out 2 weeks ago before it fell out i had a fainting spell didn’t think much then 2 weeks later it came out...I also had sex like a few weeks before it came out (unprotected) now since yesterday I have been projectile vomiting and feel really weak and a headache , I took a pregnancy test and it should two lines at first but the line went away so I figure I looked at it to early ..