Could Mood Swings And Sore Breasts Be A Symptom Of Pregnancy?

Hi i came off the pill in oct and ever since then i was having a period every 2 weeks except for this month, i should be due my period this saturday coming goin by my normal cycle. i have been very emotional and moody lately my breasts seem a little larger and fuller i feel more tired lately and i have been coming out in a fair amount of spots over the past week, i did a pregnany test last saturday which was negative and i did one yesterday about 2 in the afternoon which also was negative was it too early to test and get the right result could i be pregnant?