I am 45 and have had lower abdominal pain for the last 3 days. My doctor gave me an Antibiotic and has scheduled me for a Ultrasound of the lower abdominand also a Vaginal Ultra sound.

The pain has decrease over the last few days, but it is still there. It gets worse as the day goes on. My blood pressure was 60-100 which is low for me I am usually 120-80

Any ideas as to what could cause this.