So on may 28 my boyfriend and I were having unprotected sex and I didn’t expect him to cum inside me but he did. I took plan b 7 1/2 hours later, and I expected to get my period April 8 but it hasn’t come yet, and I’ve taken like 3 pregnancy test and it has all came out negative I keep reading about false negatives and all the symptoms of a pregnancy but all I have is nausea and cramping but that comes with taking plan b could I still be pregnant?