The symptoms you describe are not sure signs of pregnancy. It seems you have some menstrual irregularities that make it difficult to pinpoint your actual period. It is not clear which vaginal bleeding was your period and which was spotting. You can take a home pregnancy test to be srue. If it is positive, you are pregnant and you can go to your gynecologist for an ultrasound confirmation. If it is negative, you are not pregnant but you should go your gynecologist to find out why you have menstrual irregularity and spotting.