Please help..miscarriage?

Little Sun Shine
I don't know what is happening to my body..Feeling pregnancy symptoms for past 3 weeks..bloating..back pain..left side abdominal pain..nausea..My AF expected to come on Nov 7..But urine and blood test showed negative ..And on Nov 15 morning, some kind of spotting was seen till Nov 16 ,8 pm ..I felt severe pain on left below abdominal side on that time..can't even move properly..so just took test for 1 hour..on that night..I have bled like usual period ..completely wet my pad..From the next day evening, I felt relaxed..my symptoms..bloating everything reduced..still some spotting till today..my regular periods not like that..my periods very sharp and I have never experienced any kind of PMS..So what was that? :(