My husband and I had sex on a day I was 8% fertile three weeks ago. It's too soon for me to know if I missed my period, but I got really bad acne break out around my chin area (this is atypical for me) and I feel extra emotional and moody. My lower back is a tad bit achey, too. Is there any way I am possibly pregnant? Is it too soon to even have symptoms? Could I just be going through hormonal changes?