I'm expierencing stomach aches and lose of appetite .Also I had spotting for one week and three days two weeks after my period . Also I was having regular periods until July (which I started earlier and two weeks after spotting) . I had sort of intercourse with no protection after one day being over of my irregular period and took a birth control pill after inter course (which was the first pill taken) and continued taking for about 4 days (one pill each day) .I took two days one brand and the next three a different brand of birth control pills. I experienced nausea three days after intercourse but not anymore and now expierinceing stomach aches everyday and sharp pains on my sides. And have been really worried and stressing over this . Also have been excersising a lot . Could it be stress and birth control effects or possible pregnancy?