When can I test?

Paige
Hey everyone
 My hubby and I are TTC I used first response digital opk this month and got a "yes" to ovulation on day 10 (Jan 15) I'm counting Jan 17 as my first dpo...when can I test to see if I'm preggo?? I just want to know! 
My period is very irregular and lately very long (some times is 28 days sometimes it's 50) so if I wait until glow predicts the first day of my missed period that is still two weeks away (feb 7) and I have already been waiting for a week! 
When do you think I can test?

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