I'm taking PRP for past one month at an interval of three weeks, my hair fall has increased dramatically.Should I discontinue?

The research performed and the anecdotal evidence would suggest that
thickness of hair and density can improve with PRP injections.  The
number of sessions as well as the quality of PRP obtained will vary
considerably physician to physician.

Prp won't increase hair loss. Prp is effective, but I have a very specific protocol, every 3-4 weeks for 6 months with prp therapy.  I also add in progesterone to speed the healing process.  After that the injections are tailored down.  You should also be on viviscal and other growth promoting ingredients. See an expert for a formal evaluation. Best, Dr. Emer

In  my opinion, there is a small percentage of people that develop an anagen effluvium after PRP. It's probably one to two in a thousand. It is possible that you have this hair loss but more likely that some other etiology is present. Find a hair loss expert and let them evaluate you with a good examination and history. You may need a biopsy.
PRPHAIRMD.com

PRP does not cause hair loss. If you feel that your shedding has recently increased, I recommend discussion with your hair loss specialist to determine other potential causes for the hair loss and possibly starting additional treatments. Best wishes. 

It is unusual to see shedding as a result of PRP itself.However,I advise my PRP patients to also continue some type of maintenance therapy for hair loss-such as Minoxidil ,Finasteride ,Low Level Laser. Please discuss this with your doctor.

I recommend going back to the injector and discussing the issues you are having and see what he can do. Hair fallout can also occur if too much PRP is injected into the same spot

Hi, and thank you for your question regarding PRP and hair loss. Clinical studies as well as anecdotal evidence show that PRP treatments lead to increased hair growth and thickening of hair strands. However, the results of PRP generally take up to six months to appear. Your hair loss now does not necessarily mean that the PRP treatment is not working for you. You may only know if you are one of the few patients who does not respond to PRP after six months of treatment. There is a very small chance you may have a condition known as anagen effluvium which results in the significant loss of growth-stage hair strands. Only an in-person consultation with a board-certified facial plastic surgeon can confirm the cause of your hair loss. Most likely, however, you will see results after receiving the full treatment cycle. Good luck!- Elbert T. Cheng, MD

Occasionally patients may experience “shock loss” related to the injections themselves, however they should notice that hair begins to grow following this phenomena.  PRP is not a guaranteed solution for every patient and you could just have a more aggressive form of thinning.

Unlikely. PRP is not associated with hair loss but that is not to say that patients do not lose hair while under treatment. PRP does not change the normal hair loss cycle, so some hair loss while receiving PRP would be expected. Generally, it requires discontinuing a treatment for 3 months or longer to result in hair loss, so it is possible that you stopped a treatment or medication 3 months ago and that has caused the increase hair loss you notice.

It is unlikely your shedding is directly connected to the PRP injections. Since things got worse after starting the injections I would pause, have your Doctor reevaluate you.