I had a normal period on April 26. Had unprotected sex on May 11, 3 weeks later had a "period"(1 week late) , meaning it wasn't as heavy as before nor did it last as long. Follow to this month, July, I have missed it. It's been 42 days since the last one I had. I took a test and it came up negative, but I've never missed a period since I had my son 9 yrs ago. I plan on making an appt but was just curious if tests could be inaccuarate. Thank you!