Pregnant?

I've take 2 pregnancy test but came back negative. Im nervous to go to my doctor because I don't want to be even more dissappointed it's so weird though. I grew a bra size in a week, nipples sensitive to the max, I was a week late on my period in July, my period lasted three days September, now it should last 3-5 days. I'm so confused-_- I've read that this can happen but you need blood test to confirm. I'm not a fan, any other stories that come with a success? Or what I should do?