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I would wait until the beginning of May and then take another test. That is if you don't start in the meantime. Your hormones, etc. may not have changed a lot in your body yet to make a home pregnancy test come back positive. Or you may just be late. I wish you good luck. I hope this helped.
You can always go to a doctor or a clinic to take a test there; then start getting professionsal advice if it is in fact positive. Stressing about having a late period or being pregnant won't help it come any sooner.