Can you relate , please help.?

Hello, me and my husband have unprotected daily, i had my period last 2 weeks ago, and this week i feel extremely uncomfortable , i have these 'mestrual like cramps' however my period does not come for 2 weeks & i do not get this feeling till the day of, also i have been feeling nausea on and off during the day , is any or has anyone experienced what i am going through ? what was the result ; i would go to a dr, as my friends insisted i was pregnant before i thought that may even be the reason , i just dont want to go there and them tell me its too early.. does anyone also know when is the earliest time poss. to detect pregnancy .. thanks in advance