I am having pressure in my lower abdomen and when I start moving around too much I get menstrual like cramps and lower back pain. I have slight pressure when I lay on my stomach. I was on antibiotics a few weeks ago. I take birth control pills and had some bleeding during the second and third weeks of my pill pack. It was not like my normal periods and a lot of it seemed more like bloody discharge. When I was actually due to get my period, I didn't get it and still haven't even though I should have started my NEW pill pack yesterday. I took a home pregnancy test but it was negative (with both my previous pregnancies I always got negative results when taking home tests). Do these sound like early signs of pregnancy? Should I continue to refrain from starting my new pill pack until I'm sure one way or the other?