A few months ago I had my 6month girl Vesper at the park and when i picked her up I noticed she had some blood coming out of her vagina. It wasn't a lot...just little drops here and there every so often. I wasn't sure what to think and my friend told me that rats get their periods sometimes. I didn't think that was right because I've had females before and that never happened as far as I was aware. The next day there was no blood and she seemed fine so I didn't take her to the vet even though I should have (no money). So I guess I'm wondering is this a medical issue that I should worry about. It hasn't happened for the last few months and she is perfectly fine. Why did this happen?