Please help me wirh answers im begging you need advice badly ?

my last period was abnormal only lasted 2 days and was light brown brown with blood bright blood sorry tmi!! That was on 9th november ok and lasted 2:5 days i usually have 7 to 10 day periods ive 2 kids youngest 2 i was expecting my period on 7th december and they never came i done alot of tests on 28tg november i got a positive and all negatives since after that coulda been a dodgey test it was clearblue digital i keep testing thinking i am , its 7 weeks now since my last period on the 9th november ive since then last week got bloodtest and was negative and my hormones wer fine my period has yet to come and ive never missed a full period before last month my period was due 31st october but came 9th november and i would have been due 7th december i dont know what to do i want a 3rd baby and now im worried im not ovulaten if i dint get a period i dont even know whether to take the pregnancy vitamins because i didnt get a positive i really dont know what to think im scared if i am and havnt been taken vitamins and i have a cold also if my period was menta be on the 31st october but didnt get them till the 9th november does the 7th of dece,ber sound right when i was due them !!!!!