hey I'm new(:

Leona
Hey my name is Leona and I'm new to this app/group... my husband and I have been ttc for about 10 months.. I do have a almost 4 year old from a previous relationship...anyways...
I have been <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a> by opks and I have a couple different apps going. I just have a couple questions. 
My last period was December 13-16 4 days early but we will take it. Lately I've been noticing I've been craving everything I craved when I was pregnant with my 4 year old.
I'm on cd 19 of the new cycle and I have been getting positive opks for the last 3 days I've been taking opks  2 times a day one at 2pm and another at 8pm all very positive!! 
So question 
Could I be pregnant from my last cycle in November? 
Also
If I'm not pregnant why are my opks blazing positive for 3 days?