STILL NO PERIOD!!

This month is basically over and I still have no period, which is good because I'm trying to get pregnant. But the thing is that Ive already took 3 pregnancy test and they've all come back negative. It's been 2 weeks and a half since I last had sex which were on my fertile days. I do experience a lot of cramping like my period wants to come but sometimes it's this clear sticky discharge that comes out. I'm losing my mind because I don't know what's going on! Someone please explain.