My period was on time this month (July). But it only lasted for 4 days when it usually lasts for 7 days. My and my boyfriend had sex on the 2nd to last day of the period, and 2-3 days after the period was over. I then found out that I was bleeding when I went to use the bathroom and looked at my underwear. The blood was orange-ish. We used protection during sex and nothing broke. Am I pregnant...?