female dog pregnant?

Question
I have an 8 month old Chihuahua, and I am not sure if she is pregnant or not. She hasn't been eating a lot lately, but her tummy is  bit swollen (I think). She was bleeding at the begining of her cycle, but now her teates are swollen and so are the glands. Her vulva keeps on swelling as well. Is she pregnant or do you think this is going to be part of her natural cycle each time.

Answer
I hope your not telling me that you bred a 8 month old Chihuahua, that would be too early and could be detrimental to both her physical and mental health.

Did you take her to a male?  That is the only way for her to become pregnant.

When a female is coming into heat, they swell and bleed.  They can go through a pseudo pregnancy which would cause her teats to swell.