Could I still be pregnant?

I've been on the bc pill for 8 years now. The first day of my last period was June 20th and on June 26th I had unprotected sex twice. A little while before then I accidentally forgot a pill until the next day. Recently I have just been feeling off. Very moody, tired, dizzy, and really nauseous. My breasts aren't tender (which they usually are before AF comes) and I don't have any unusual food cravings or heightened sense of smell. I just feel weird. I took a pregnancy test this morning and it came out negative but I still feel weird and nauseated. I've had very very mild cramping today and just some brownish discharge. Otherwise my periods have been very regular. Just wondering if I should test again in a couple days.