Hello. I had unprotected sex on the 15th of April (CD20). I got my period on CD 27, 23rd April which lasted for the normal duration. My predicted period for May was due on the 19th, 2 days ago. I have not had any sex after the 15th of April. Taken urine pregnancy tests and a blood test on the 20th, all were negative. I had earlier noticed fertile fluid on CD 17 and CD 18 instead of CD 14 and 15 as in April. What do I do?