The first day of my last period was 27 Aug, and the one before that was around 30 July. For the last 2-3 weeks I have been extremely tired, get dizzy, easily irretated, have a bit of lower back ache, and last night for about half an hour out of nowhere had a soapy taste in my mouth. Could i be pregnant, and did i have my last period because my hCG levels werent high enough at the time? Have never been pregnant before.