I am 27 years old, off birth control pill for 9 months. No birth control used except rhythm. Last had sex 12-31-13. First day last period was 12-11-13, period due 1-11-14/1-12-14 and nothing. Was in ER Jan 4, 2014, diagnosed with pelvic infection(pain, vomiting, diarrhea, low fever) though never shown on testing, prescribed doxycycline, 2x day for 10 days. Very frequent heartburn, headaches, fatigue. Could I be pregnant? Is it too early to test? Could an infection be causing the late period and antibiotics some of the symptoms? I have never missed a period except when I was pregnant with my daughter 8 years ago. ER did urine test, vaginal ultrasound, pelvic ultrasound, ct scan and blood work. Gyno also did pee test. Have cramps/back ache like impending period and nothing. What should I do? Test, not test? Do I need a blood test?