I had unprotected sex with my boyfriend on Nov 4th (I haven't had any sexual intercourse for 2 years) I started spotting that night and the next day, I either started my period that night or the following day..I usually start my period a little later than that, possibly around 8-10? give or take. I again had unprotected sex on the 15th(which I bled afterwards for a while). I been starting to get nauesated (more in evenings), lower back pain, headaches, more tired, and dizzy. My nose has also been running more than usual? I know it's not a cold because it's been going on for a week or more now and my colds are usually bad. My breasts haven't been bothering me though... I'm not sure if this is possible to be pregnant that close to my period, and would be too soon to be showing signs for the 15th or if this is all in my head?