So, im 4 dpo, ive been feeling a little nausea, the ither day felt like a bubble popped in my abdomen (cant remember what day, but was in the evening) then last night, i had a little discomfort behind my belly button accompanied by a feeling of a bubble popping in abdomen again (this only lasted about 20 seconds) my back is aching a little bit, and im due on, on the 14th of feb ( yup right on valentines day lol)...... my boobs a the slightest little but tingly and havent shrunk since ovulation started, which could be nothing......

Any one else had this? What could it be?