45 and whats going on?

ok I am 45 and have been inactive sexually for many many years, I have grown children and even grandchildren now. I have been dating this man for some time now and we decided the time was right. We were careful, or so I thought, but here we are a month later and suddenly my breast are tender and feel thicker and my nipples are even leaking a small amount of white fluid, I have had waves of nausea for 3 days now and very fatigued where I find myself needing several naps a day. I have experienced heartburn a little more often than usual and even a bit of blurred vision from time to time. My need to urinate has increased a bit too. I have read online that at my age getting knocked up naturally is almost impossible and we did use a spermacide. Could there be anything else beside pregnancy that could cause all these symptoms at one time? I know that there are a lot of different things that can mimic pregnancy but none of those things mention the breast problems I am having. Have not done a test as of yet.