Is the pregnancy test still accurate if I take it a month after the missed period?

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I haven’t had my period in two months and I continuously took 4 pregnancy tests, one every two weeks and they all came out negative. Me and my boyfriend are still very worried. Could I possibly be pregnant?

If it’s been two months since your last period I’d say the results you’re getting are pretty accurate.
Regardless you need to see a doctor to find out what’s going on. He might suggest a blood test for pregnancy which are more accurate than home pregancy tests.