Two negative tests but 5 days late on period...could I be pregnant?

So my period was due last Tuesday and I am usually pretty on time (maybe the odd day out) But I have took two pregnancy tests and both come back as negatives. I was on the contraceptive pill for three years and then come off due to getting headaches. I have had a couple of symptoms such as nausea and feeling a bit... show more So my period was due last Tuesday and I am usually pretty on time (maybe the odd day out)
But I have took two pregnancy tests and both come back as negatives. I was on the contraceptive pill for three years and then come off due to getting headaches. I have had a couple of symptoms such as nausea and feeling a bit emotional.
When would be best to test again and has anyone else experience this before?
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