Irregular period and Pregnancy Test

I havent had a period since febuary 6th....and now its April 17 and i still havent had one....In febuary i was taking SOOOO many test and they were all negative 😩 Irregular periods run in my family my mom didnt find out she was pregnant with me till about 13-17 weeks 
My sexual life is really active....I dont know when i should test 
Im sitting at work now and im exhausted and thats not normal for me since ive started working this 3rd shift....
When should i test or what should i do ?

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