Help me!! Pregnant or nt

Im 28 days late. I took 2 test both came out negative (This was around time i was 1/2 weeks late). My breast have increase in size, sore, and I have the little bumps under my nipples.The bumps around my nipple look more visible. I am always tired, frequent headaches, backache,legs hurt,smell increase, and stomach look bloated. I sometimes feel like i have a gas bubble in my stomach. I have discharge brown for 4 days. I only needed a pad a day. Could i be pregnant?