I Had Sex On Sunday In The Morning I Was

I had sex on Sunday in the morning I was just getting off my period that day. We just used the withdrawal method. For the next day or so I had what looked like old blood. Two days after sex I had a dream I was pregnant, the next day I fell asleep extremely early because I was tired. And now four days after sex I have a slight fever of 99.2 and extremely tired. Pregnant?