3 days late, when should I test?

I am 28 tomorrow but 3 days late on 6/4/21 - I tested this afternoon and negative but I have not come on my period and I also am having weird cramping and light white discharge which is very different from normal. I am very regular since November. I had a Smear before I ovulated this month and changed my folic acid tablets from boots own to pregnacare. Those are my only changes this month. Anyone who has any stories where they tested negative and then positive later on or something similar. Advice would d be great.
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