I had unprotected sex last May 9 and I took Nordette (as ECP) on May 10. Took pregnancy test (urine) last May 17 (got negative). Then Last May 19 there's a little reddish brown discharge on my pantyliner. My period is due on May 21. My average cycle is 30 days. My last period was April 21-27. I took another pregnancy test this morning and it turned out negative though I still have brownish discharge. Still want to be sure if I'm not pregnant. Please enlighten me. Thanks