hi my period was due to come on may 13th, it is now may 18th and it still isn't here. But after my last cycle I had unprotected sex a week after and I noticed that a week after that I had light spotting for about three days so I thought it was due to stress. But I can't understand why my period is late? Instead of blood, I see a clear slimy liquid on my underwear. After reading some early pregnancy symptoms I don't have much of it. The only symptoms I believe I have are mild back pains after walking up the stairs at work, shortness of breath, occasional itchy nipples, constipation at night and tender breast to the touch. Am I pregnant or am I just stressing?