9 weeks/fetal Doppler

So I'm 9 weeks with my second little one. I can't remember the first time I was able to use my at home fetal Doppler with my first one (June 22nd, 2013). And I'm curious if you ladies have one, when it worked for you all. I have the Facelake JPD-100B. I'm 9 weeks and can't seem to find it on my Doppler. I do have an appt today though, so hoping this will give me closure the baby is okay.