Thank you very, very much for your help! I greatly appreciate it!!
it doesn't sound like you could get pregnant from that sounds like your having problems with your cycle being irregular which is normal for a teenage girl the dark blood was probably old blood nothing to worry about and your other symptoms sound pretty normal for most women especially around the time they are going to start but if your still concerned you can take a pregnancy test and see what it says
No sperm cannot travel through clothing. There are a lot of things that can cause your period to get all screwed up or be late. If it happens on a regular basis you may want to see a OBGYN to find out what is causing it. Usually it is nothing serious. Some things that can cause irregular cycles are a condition called PCOS, being underweight, being overweight, and sometimes stress can even cause it. I am sure there are other things but those are the only ones I know about. As for brown discharge, that is normally old blood. Some women experience this shortly before they get their periods or shortly after. As for the dull sore breast, that too can be related to your menstral cycle. Again, if it continues and you are concerned, you should see a doctor. Good luck.
I am also experiencing a dull sore feeling on my left breast.