Ovulation and menstrual symptoms are also similar. I only started having sore breasts a few days after my test kit shows a positive and 2 weeks after that, all the morning sickness, heightened sense of smell, food aversions all comes at once.
Try to wait a week after your missed menses to see. Even if you used a ClearBlue digital kit, you will still have to add 2 weeks (says 1-2 weeks, that means after conception + another 2 weeks, you're about a mth + pregnant).