Hi there I ve been experiencing a lot of pain in my lower abdomen area. My menstrual cycle is irregular as I have missed my period in April and got it in May and now it is late and it s already the 26th of June. I have had intercourse but always with a condom?There was just once were my boyfriend and I did not use protection but he pulled out. What could the reason for the pain and moodiness be?my stomach tummy constantly feels upset after I use the toilet. I normally get these symptoms before my period but just slightly concerned as I am now having intercourse. Any advice or help will be appreciated. I have also taken two home pregnancy tests and both were negative.