Hi! I'm wondering if you can help me. My name's Sian. I'm 18 and underweight - so my periods are irregular, however I have the same app as the my cycles on my phone and my next periods not due until the end of the month (28th), I was high fertility 7 - 11 and ovulating on the 12th. My boyfriend and I had unprotected sex on the 11th and now I've noticed light pink spotting when I wipe after going to the toilet. What could this mean?