Should i take a hpt if its been almost 3 weeks since my m/c i had sex with my husband couple of different times w/o letting my period recover?

Not necessarily: I am sorry to hear about your loss. A home pregnancy test could still be positive from the recent pregnancy and it is unlikely that you have successfully ovulated again since the loss. Although you are likely anxious to have another pregnancy soon, my advice would be to try and wait 1-2 weeks before testing at home. Many mds advise completing 3 full cycles before trying again.

Sure: There would be no harm in checking a pregnancy test, especially if you have had unprotected sex. Best wishes.