early symptom??

lately my feet have been itchy as hell. they arent dry or dirty or anything they just itch like crazy on the bottom. could this be and early symptom or no? im currently 4DPO. also ive been getting a weird pain in my stomach.. almost like how a brain freeze feels but in my stomach. My back has had shooting pains in the middle the past two days im just wondering.. probably not but i suppose its a possibility :)