what the hell?

Please help! I'm so confused! Okay so last month I got some opks they were positive the 14&15 we had sex both of those days. We weren't exactly trying then just seeing what happens&hi wanted to see if I was ovulating because we haven't used anything in a year and nothing, but this month we want to start trying. Buuuut. I still haven't got my period. It was porjected the 31 until yesterday. I wasn't having many pms symptoms but now my boobs have been getting sore, slight cramps, headaches, I've been pretty nauseous for the past few days, heartburn, my tempature has been between 98.1-99.-1 the past few days. I'm not sick. I'm assuming I'm just late. So now apps are saying its suppose to start the 6th.(i know they're just perdictions but they're usually on the dot) I've taken a lot of test not even a faint positive just a bfn. Then I felt a discharge coming out so I thought maybe af, but no it was a clear stringy discharge like when you ovulate? Why did I have that when I ovulated weeks ago, and my period is suppose to be coming? I checked with a opk and it was negitive. I'm just confused what's going on with me and hopeing someone has some insight and could give me an idea what's going on. I don't know what the doctor would really do for me now if I went, so I don't know if and when I'd even go.