I stopped taking my pill on the Friday, near to the end of the pack. It's now Thursday and I haven't had no withdrawal bleed or period, I've had lots of unprotected sex. I took a pregnancy test yesterday came up negative but then I took another one and I had a straight line in the negative part and a horizontal line in the pregnancy box (the line was ment to be straight) could I be pregnant? Also I've been really emotional, head aches, cramps and just really not myself..... HELP PLEASE