TMI strange, any ideas anyone?

Two weeks ago I had sex for 4 days in a row unprotected.He did come inside of me.  On that last sex day my period was suppose to come according to eve. In the past 6 to 7 months, eve has been pretty accurate predicting my period except for my last one. It was a day late.  My period usually lasts 8 days but that time it only lasted 5 days. After my period was over, I have been having pregnancy symptoms,  not sure if it's because I'm so anxious about it,  due to finding out I was pregnant at 7 months my last pregnancy. I took a test and it was negative.  Last night after a 3 hour flight,  2 weeks after last having sex and 1 week off my period there was an unusual mucus in my liner (picture posted). Not sure what to think of it. Help please!?! Oh and according to eve I'm ovulating today.