So my period has come 4 days early but it's very light and it brown. This is odd because usually I am very heavy my first couple of days. My boyfriend and I usually use the pull out technique but this certain time was different. We usually had sex once a week but we didn't for about a month and then the last time we did he either ejaculated prematurely or he ejaculated and didn't know (I don't think this is the case) So immediately I drove to Walmart and got the pill I took it within 3hrs. Is this change in flow normal?