no period no signs of pregnancy

I am very confused. On CD15 I had a positive LH surge we BD'd as we should've a couple days before that and a few days after. I am on CD34 and have not had AF, but no signs of pregnancy either. My boobs are very sore but that's it. I have been very stressed this month, changed my eating habits a bit and also been working out more regularly. My cycles are usually 29-31 days. I'm scared to take a test, because I'm afraid of a negative result. Should I just keep waiting a few more days?