Crazy period advice

Shavonne
I have a question last month I was late 6 days for my period and I took a pregnancy test and it was negitive, my period started on the 7th day
 I always have very predicable cycles and I never been late unless I was pregnat. 
So this month my period is late again I'm 3 days late, should I wait to take a pregnancy test or should I go ahead and take one? 
This is very uncommon for me to have irregular menstration cycles. My normal cycle days are 28 days, which last 4 days. I'm getting worried. Is this something I should go to the hospital for?
Sorry my husband and I are trying to conceive.

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