Need some support our reassurance.

Last Friday I started feeling little cramps more to right side of pelvic area. Saturday my boobs hurt so bad on the sides and they were really warm. Had a few moments of feeling content with life. Then Monday came and was like a switch. I have some cramps it just feels sore. My boobs still hurt not as bad not as full feeling anymore. And I check my cervix our was low but soft. Light cm. I don't know what to think. All my tests I have taken are negative. I feel as tho I am going crazy. I am fighting with SO all week. I cried yesterday over something that never hurts my feelings. I am currently 12 dpo. What is going on! !!