I went out for a trip with my boyfriend and had protected sex from 10th to 13th January 2018. My period came exactly on my due date on 16th of January 2018 till 19th January 2018. My periods are never heavy, and always light. My next due date was 13th February 2018, but I didnt have my period. I didn't have any sexual activity since 13th January 2018. Am i pregnant? Did i mistook an implantation bleeding for period? I dont have any pregnancy symptoms.