Hi, About a week ago I experienced a deep pressured cramp in my pelvic/lower abdomen area, it lasted about 10 seconds and went away. Since then I have been experiencing sharp and dull twinges, as well as bubble feelings ranging from my lower abdomen to my upper (they are typically on my left and right sides but a few have been centered around my belly button) I am due for my period tomorrow and have had typical symptoms that I experience every month, breast soreness, fatigue and headaches. I typically have cramps but besides that one a week ago I haven t experienced any typical cramps. My husband and I are trying to get pregnant with our second child so I took a pregnancy test yesterday but it came back negative. Any idea on what could be going on with the twinges and bubbles I have been experiencing? Thank you!!