Should I be concerned with a tubal pregnancy?

Last period was very abnormal. I spotted for 3 or 4 days afterwards. Thought that was not that big of a deal. Well, it is now 3 weeks later and I have been spotting for the last 5 days but no actual period yet. I do get cramps here and there like I'm going to start my period. Also, my anxiety has all of a sudden gotten real bad and I'm shaky all the time. Because my tubes are blocked I am at a high risk of tubal pregnancy if I ever did become pregnant. I am thinking I could have a thyroid problem because of my mom and grandmother have low thyroid as well. I don't think it's very possible to have a pregnancy but is it something I should consider? I also cannot bring myself to eat anything but bread and drink nutrition shakes. Food does not interest me. I'm not sick, although a few weeks ago I was a little nauseous at times. What is going on with me. I am getting to a doctor asap but wanted to know if I should rule out pregnancy first because it could be serious if it occurs. Is spotting and irregular periods a sign of pregnancy?