so I had Mirena inserted May of 2015. I've had a normal period every month since then (around the 20th of each month). Last month I completely skipped my period, and I'm now 16 days late. I've had unprotected sex (same partner) several times during the last month. My mouth is watery all the time and I have an achy, heavy feeling like I'm supposed to start my period. I've been pregnant before, but then I had tender breasts and nausea, and I also had implantation bleeding... I don't have those symptoms now. I've taken 2 pregnancy tests, and both came back negative. I'm going to the Dr in the next 2 weeks, but I'm really nervous about what's happening with my body. any thoughts?