Hi everyone. I have a maiden bitch 3 years old I was hoping to breed. I first noticed the drops of blood on Wednesday April 3rd. I was told to monitor color of blood for change. On the 7th day I noticed it got a lot lighter and she would flag when I would pet her. Introduced her to Stud that same day April 10 but had no luck. She showed interest a few times but then just got snappy and just kept running around all over the place. We decided we would try again today or tomorrow. However trough out the day I check for blood like I had before but haven’t noticed any. Plus she no longer flags when I pet her. Is this normal? Will she no longer accept stud?

Rather than guessing, you may be best to have a progesterone test.

> Is this normal? Will she no longer accept stud?

Actually the opposite, this is probably the most fertile time.  She rejected him before because you were probably too early.

However it worries me that you are about to breed a litter of puppies and you don't know that the absence of discharge does not mean that a season is over and haven't figured out the above for yourself. 

A bitch should be considered IN SEASON for at least 21 days and probably 28 days from the start of first blood - unless you are using testing of some kind (progesterone, cytology) to determine otherwise.  The presence of absence of blood has nothing to do with it, other than some vague indicator which not all bitches follow.

There is WAY more you will need to know for the health and safety of your bitch, if you want to successfully whelp healthy puppies and raise them optimally.  If you don't even know that the absence of discharge is probably the most fertile time in a bitch (and that day 7 is actually pretty early to breed and days 11-15 (where you are at the moment) are absolutely bang on average fertility time for most breeds) then I really am not sure you should decide to breed her without learning more about breeding, having a mentor, reading a lot more books and doing a lot more research - your bitch's life could depend on it.

I think it might be wise to miss this season and give yourself time to do some research. At the very least please invest in a copy of this book:

The Book of the Bitch. By J.M. Evans & Kay White.

You may also find this thread if some interest: Should I breed from my pet bitch?