Am i pregnant? please help me?

I asked a question the other day but now I'm having more symptoms. I got my last period on April nineteenth and we had sex alot and my cycle is usually twenty eight days and on may twenty third I noticed I i wiped very light pink what I think is spotting. I thought it was the beginning of my period but I've been very lightly spotting brownish redish pinkish blood on a panty liner for the past three days. Its not alot. My periods are usually long heavy and painful. bUt I haven't had any cramps. My nipples have a brown ring going around them and I've been feeling nauseous for days. Please help?