I got my implant part 1 a month ago and today it's really loose & going to fall out, why?

Hello!
 There are three parts to an implant, the implant, the abutment and the crown. During the course of healing you will not have an abutment or crown right away but rather a healing cap. Sometimes this cap may become loose and must be replaced. I would call your treating dentist and see if you can get in right away for it to be tightened so you are not uncomfortable.
Best of luck!

Hi:If the implant is loose, it means the implant did not get integrated with the bone.  However, sometimes the healing cap can be loose and the implant is still tight.  Please go to your dentist immediately.Best,Dr. Maddahi

Nothing should be loose. You need to go back to your dentist and have the part tightened. There are several reasons why this could happen, but without knowing exactly what part is loose, I can't say for sure.