Symptoms Since ovulated

[Journiebaby11]

I had mild back pain Tuesday Nov 19 and had intercourse that late afternoon (not preventing nor trying) In evening I was achy and crampy even worse and by Wed Nov 20 the abdominal cramps and aches, leg pains worsened to where I almost wanted to take something . Thursday early afternoon I noticed vaginal discharge.. A lot that was like snail discharge.. By afternoon on that Thursday Nov 21 cramps and all stopped. I assumed I had sex obviously during fertile time. three days later I had sensitive nipples , Tuesday nov 26 my boobs were tender and sore , cramps have been happening ever since,I have been irritable, and sleepy . Nov 29 I had mild nausea and frequent bathroom trips that day, and today the boob tenderness was less but still cramps. I'm due for my menstrual on Dec 7 .. and I did take a pregnancy test this evening and it was negative. I'm confused as to why I've had all these symptoms last 2 weeks since inter course . Has anyone had these symptoms and still started? Oh, I am 27 days avg cycle , lp on 11/9/13..no birth control or any other conception issues. Sorry not used to terms