Irregular

My last period was on December 3rd to December 9th me and each week after me and my bf had sex twice each week! It is now 1 month and 2 days since my last period. Ive been having some symptoms,my nipples are darker! I have mild cramps but doesnt stay for to long then moves to my back and goes away. My discharge is white and it seems like theirs more discharge. No odors or irritation. I took a test yesterday and it was negative.