Implanon Removal: Light period 3 days later and no period after that.

Hi I am Tamara I had my implanon removed due to having migraines on the 13th of February 2012. I was feeling all the pregnancy symtoms after removal. My doctor just told me that it was normal and I told him that I started bleeding on the 16th of Feb and it finished on the 20/21st of Feb he just said it was a light period, he then told me that my good days to conceive will be on the 1st of March. I then looked up for a fertility calender and I put the first day of my period in which was the 16th, according to my Calender it says my good days started on the 24/25th of Feb my partner and I had sex once everyday from the 24th of Feb onwards. I started spotting, first it was a few drops of really dark red, then turned to a brownish discharge like stuff well that started on the 10th of Mar and stopped on the 15/16th of March. My period was due on the 14th of March it is now the 23 of March and I still have NO PERIOD. I checked my Calender and it was exactly RIGHT! I've taken 2 HPT'S and both were NEG :( during this time I've had some pregnancy symptoms like Fatigue, sore and sensitive breasts/nipple area , slightly dark areolas, little cramps here and there, more hungry, going toilet more than usual but not every 5mins just more than I usually do, oh and my boobs feel heavier and quite larger than normal and a bit of tightness around the lower part of my tummy and when I push my tummy just a little bit it hurts in certain spots . Very confused Could I be pregnant or is it just my imagination? Please really KEEN to know what's going on.