Pregnancy and periods

Anyone bleed but was actually pregnant? I've heard of decidual bleeding (not an actual period but period like bleeding while pregnant). Last pregnancy I bled alittle but was already four months pregnant and the doctors never really figured out what it was.  I've been ttc for almost a year now and right before my last af was due I started having all the right pregnancy symptoms (same symptoms I had with my other two pregnancies- sore breasts, bloating, nausea, super super tired) and then the day my af was due I started bleeding. So I got upset and threw in the towel for this month. I bled for five days... Bright red blood (sorry tmi) and stopped at the fifth day as usual. My only concern is that my breasts are still real sore and I'm still extremely tired. Two signs that I've only had when pregnant. I'm wondering if it's at all possible that I had decidual bleeding that just seemed like a period but really wasn't. Has anyone ever experienced this? If so would you please share your story with me? Anyone test positive after the supposed "period" and actually been pregnant? This is driving me nuts! Tia ladies xo