I read on an earlier post you believe it is a bad idea to go on and off propecia, this is exactly what my dermatologist has recommended as he is dubious about staying on the drug constantly.
If the drug works by helping block DHT production surely this shouldnt be an issue? ie in the months you dont take it DHT production may rise again, but every other months is better than not at all? Or am I being too simplistic and hair cycles etc come into it and im making things worse?
I write because on the recent resumption of taking it I seem to have quite alot of shedding.
regards
Going on Propecia and then going off of Propecia is a bad idea. I have seen many men stop it for 4-6 months and they start losing hair at about a month, which quickly becomes evident at 3 months. If they restart it again, they rarely go back to where they were before they stopped the medication. I don’t know where your doctor is getting that idea from, so I would suggest that you ask him/her for clarification.
Female genetic hair loss can be triggered by pregnancy. There are unique patterns of miniaturization is associated with the genetic process (even in females) and this pattern is easily seen with good densitometry studies mapping out the head for 
Yes, to put your mind at ease, 
I cannot make a diagnosis or give a second medical opinion via the internet, because I am limited to your description and I have not examined you in person. When a doctor says “it may be too early to get work done”, you might want to let his words ‘sink in’ and consider this as reasonable advice. If the doctor makes his living doing hair transplants, then if that doctor did not want to sell you a transplant, it should add a bit more value to the recommendation to hold off doing a transplant. As a general rule, before you consider a hair transplant, you and your doctor should review the Master Plan for your furture hair loss and your expectations with the various options. After both you and your doctor are in agreement to have drug therapy (such as Propecia) or undergo a hair transplant, then you can work from that plan. At the hands of a good hair transplant surgeon with good planning, a hair transplant should look natural and undetectable to anyone looking at it. I have many patients whose transplants looked so good that they could have even fool my trained eye. 
Some things that you are referencing cause hair loss. Propecia may protect against the effects of building DHT levels caused by the anabolic-like steroid metabolites you are also planning to take. There is some balance here, but no assurance that what you want to happen will actually happen (i.e. cancelling out the bad effects with blocking agents like Propecia). Like a seasaw, it is a balancing act. 
I would doubt that there is a correlation between the two. To get traction alopecia from a car headrest, you would have to spend a great deal of time in the car. If you believe that the two are related, then you should change the headrest, stop using it, or put an ‘airline’ type pillow between your head and your head rest.
You should address these issues with the doctor who did your surgery. A good patient/doctor relationship is critical in achieving a desired goal. I would be concerned about things like pimples, because early folliculitis can behave that way. Two weeks after a hair transplant your skin may still be healing and it is sometimes normal to have some discoloration (especially after shaving, which causes irritation even more). The degree of discoloration should be something judged by your doctor so that you know if it is beyond what he expected.