This month I started to use contraceptive pills for the first time. Everyday I take them at the same time, maybe 20min later or sooner. Yesterday was the 9th day of taking the pills and I had sex without any other protection, and he ejaculated in me. After that there was a small amount of blood, I tried to clean myself afterwards but ir was painful, coulndn't do it. The next day I was having a headache and I didin't wanted to eat anything. Does this mean something? Should I take plan B? I really don't want to, but I'm scared because I used contraceptive pills for a very short period of time