Help?

So..when I visited my boyfriend during the first weekend of March and we had sex a couple of times (unprotected and with no EC) and I was due to start my period on the 1st so we kinda took advantage of it. It's now the 25th and I still haven't started my period- I took a pregnancy test last week and it can out negative. This morning I noticed some spotting but it wasn't a right lot. So I'm just a little concerned- should I take another test or leave it?