Hi, it would be really unlikely that you'd have positive blood pregnancy test with 10 negative urine tests. You are sexually active but so smart and responsible that you have always used protection. When they talk about pregnancy when a condom is used, it's because a condom breaks. Which is very noticeable. They split wide open and you'd not miss it. You never had that. I wouldn't suspect you are pregnant from what you say but that your hormones are out of whack. This can happen to anyone at any time. How old are you? We'll go from there.