Poor baby!! I found this website for you, hope it will help
Dog Heat Symptoms
I have a boy so I have never delt with anything like that, but I am also a women and know what she is going tru!! I am sorry I have no great advice for you, I would just get some of those pads for dogs just in case she starts bleeding, I think you can get them at petsmart?? You can also "google" some info as well, you would be surprised what you find on there
...I think you should also wait a couple weeks after she has her 1st heat before spaying her...I believe "elliemay" is reallllly good about that kind of info
you should find her on here hehe... I did the best I could....Good luck