Typically with facial hair, treatments can be performed as often as every 4-6 weeks; that being said, you are not even at a full 4 weeks post initial treatment yet. While the re-growth you currently do have could certainly be treated, I would advise giving a bit more time so that you can get the most out of your treatment.
In my practice I use diode lasers for the best outcome. I typically have patients do every 4 weeks for the first 3 times and then every 4-6 weeks for 3 times after. If you have little to no hair growth, I suggest waiting so you are provided with optimal results. Best, Dr. Emer.
I recommend that you wait until hair growth resumes in order to get a good result. Hair growth rates vary between patients and areas on the body so it is difficult to give you an exact number. If you go too soon then you will not get the same benefit from the treatment.