My last period was Sept. 22nd. I had unprotected sex on October 16th, I ended up missing my period October so I figured I was pregnant. Out of the blue on November 20th I started bleeding, like i would if i was having a regular period, and it stopped on the 23rd. I've heard a lot of different answers like it was probably an early miscarriage but I'm wondering if i could have just had vaginal bleeding, because my stomach looks like its starting to form and my breast are sore.