I had my last period the 01-20-16 and I haven't seen any spotting or typical signs i usually get right before my period this entire month.I had sex on the 29th of Jan,5th of Feb and 7th of february.According to my period calculator I am about a week late.Now I know that these things can be off but lately I've been reaply tired,my boobs are heavier and sore.No cramps and no sign of period anywhere.What's going on?