While I was TTCing I had some months where I had really strong symptoms but wasn't pregnant. It's almost like I was talking myself into thinking I was pregnant. When I actually was pregnant the only symptoms I did have was mildly sore BB's, bleeding gums and stuffy nose before I tested positive. Have you had a dip in temp? I had dips in both my positive cycles after I started temping and that for me was a dead give away.

Good luck.