Jumping to conclusions?

I've been using glow for about 6 months and has been great. However about a week and a half ago me and my partner were both half asleep and had morning sex without a condom on a high risk day (whooops). All this week I've had lower back pain, black head break out on my chin and forehead as well as spots on other parts of my body which is unusual, food cravings different to normal before a periord or lack of appetite other days, headache dizziness and blurred vision. I recently started a new job that involves sitting at a desk on a computer all day (which I'm not used to in the slightest). I've been putting these symptoms down to my body not being used to a new routine but know I could be pregnant. Any second opinions or advice would be appreciated.