I had unprotected sex on may 23 and was expecting my period on the 31st but it still hasn't come as yet. I have missed my period once last year but I did not have unprotected sex at that time and I think it was due to stress. I am not stressed now. I did a pregnancy test yesterday and it was negative. Is there something wrong with me or can I be pregnant but test too early. I am 26 years old and have one child.