bearded dragons mating

Question
QUESTION: hello i have a male and female in the tank together i bought the male thinking it was a female , they have been attempting to breed for a few months now it was only 2 days ago i actually see them breeding then a wile later they bred again is this normal for them to breed a number of times ? my male is very agressive with my female i thought they bred once not over and over ? if my female is pregnant this cant be good for her surely ????

ANSWER: Hi Natalie,
Many males are very aggressive when breeding and they can cause scratches, bite marks and even a tail amputation to the female.  
They will breed over and over during breeding season. Females will lay from one to even 8 clutches of eggs that can be a few eggs each laying or it can be more than a dozen. They lay eggs every few weeks.
If you don't want more bearded dragons to care for(hatching, etc) then when the eggs are laid, you take them and place them in the freezer for a few days, then discard them.
Each should really have their own cage. Generally, the females are put with the males for a short period during breeding season.  Females can and do lay eggs, even if not bred.
I suggest separating them now.  I'm also guessing that both your dragons are young.  If they are under 2 yrs old, breeding can cause problems with both the male and female.  Prolapsed HemiPene is common with young males.  This does require vet treatment.  With females, it can lead to egg binding which also requires a vets treatment.

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QUESTION: i dont mind having more to care for =) how long does the breeding last for and if my female is already pregnant is it halmful for him to mate with her the are both around a year to a year and a half old how will i know if she is pregnant ?

Answer
Hi Natalie,
When I say "more to care for" what I mean is that first, you would need to purchase an incubator(herbivator) to hatch the eggs..then after they hatch, you will have anywhere from a few to possibly 2 dozen or more hatchlings to feed. This means  a lot of green leafy vegetables, and about 1000+ (yes, one thousand or more) pinhead crickets anywhere from every few days to a week, depending on how many hatchlings there are.  You would need large tanks to house the hatchlings, each tank having its own heat, thermometers, UVB and other items..and many times there are aggressive hatchlings that need to be placed in their own tank, with its own heat, UVB, etc..
Multiply all of this by a few dozen to hatchlings to 5 or 6 dozen hatchlings to care for.
Yours are really to young to allow to breed.  As I said earlier, it can cause health issues with both sexes a long with injuries.  They need to be separated now(meaning yes, it can harm them if they continue to breed)......so each right now needs to have their own tank, heat source, UVB, etc.
Reptiles do not become "pregnant"..they become gravid.
Its hard to tell how long breeding season will last..it can last well into the summer months.  
As to knowing if she is gravid, generally she will slow down on eating as there is less room as the eggs form and of course she will become bigger in the stomach and then you will see lumps, which are the eggs. How everything goes is dependent on her past care, current care and as I said, age. When they do not get all the proper heating, UVB, diet of both calcium dusted, gut loaded insects,and dark leafy greens, the female cannot get the needed nutrients to form and lay eggs.
It may sound like fun to hatch eggs...but its very expensive to get set up for eggs and care for and feed hatchlings.  If you don't have a soure to get thousands of pinhead crickets, your hatchlings would starve to death in short time.