HELP ME!!

My husband and I have two boys and are currently working on having baby number three... and we have been ttc for four months and nothing! I am 11 or 12 DPO and my boobs hurt so bad, without even touching them, I have been nauseous all day yesterday and some today. I have low back pain but that’s common approaching my period. And I couldn’t stand the smell of cooking chicken! I took a test today and it was negative. I’m supposed to start my period in two days. What do you guys think?