I missed my period for this month.I went to the doctor because I had chylmedia and I had to take medicine for that so I asked her if the medicine had anythng to do with my period not coming on and she said no so she had me take a pregnany test there and it was negative.she said if it doesn't come on in another week then do another test, well I waited another week and took another test and it came up negative again so I waited another week and it came up negative again. So could it possibly be that I'm pregnant or not?

Even though the medication may not, STD's can surely affect your cycle. You have to remember that an STD is an infection inside your body. It will cause some changes. Good Luck.

Even without an std you can miss a period for no reason at all. Sounds like you aren't pregnant. Make sure you are using protection from now on!

Stress and/or worry can cause a missed period so if you are worrying about having an STD this could be why you are late. Doesn't sound like you are pregnant.