Late period and spotting

Rachel

So my period is almost 3 weeks late (18 days) and I have pretty regular periods usually. Just the other day I got some random very light spotting which i thought was the start of my period and then nothing again. I took 3 pregnancy tests, 1 when I was about 3 days late, then another at around 5, then another at around 7 and all negative.

Anyone else have a similar experience and then suddenly get their period, or have a positive test later on?