I had unprotected sex on Tuesday 17th of December and Thursday 26th of December. I had missed my pill on Monday 16th and carried on not taking my pill incase I had fallen pregnant, because I was not sure if it would damage the foetus. The past few days I have had nausea, stomach cramps, change of appetite, headaches more often than normal, very sore/tender breasts, lower back pain and feel like I need to urinate more. I am wondering if I might be pregnant and when would be a good time to take a test?