What Could Clear And Stringy Discharge After Intercourse Mean?

My period is due Friday or Thursday. I had sex on sept 6 and on that day and two days before I had clear stringy discharge and some watery. Two days after having sexy which was unprotected I have had off white discharge one day and today I had milky white discharge. I have no signs of an impending period and I am not stressed either. We are wanting to conceive. Am I preg? I looked at a calander and it said I had sex on cd10?