Hey ladies

I have a question my last period was on November 29th and ended on December 5th and so far I have not received my period, but I have to say that my period is irregular but my back hurts and I have all the symptoms before period and my the back of my waist hurts and I have like stabbing in my stomach and I did several times More than 5 times at different times pregnancy and ovulation test and came out negative so I'm really confused and stressed 😞 because I'm trying for a baby with my bf.