two positive test but dark blood spoted on correct date

hi sisters,im very new for all this things and having no body to share my problem so plz help me in this.my regular cycle is of 28 days..means i always get my periods 5 days prior to my last date for ex. if i had a period on Nov 15 then i wall have my periods on Dec 10th.but mc didn't star on 10th so after 12th Dec i did my pregnancy test at home which with positive result..and for conformation again on next day morning i did test it again comes with positive result...me and my husband was very happy but today on 14th Dec i spotted very dark red blood not clots im confuse wether its my regular period or not..im trying for my first baby so please sisters tell me whats this ...is it ok or not