Help a girl out please

Sophie 👧👼👼

Help please- I came of my pill 14 January I havent had a period since March 2019 before my last pregnancy. I had some light spotting for 3 days which i marked down as a period but since then i havent came on my next one like i was expecting to. Negative test on 21st and 25th of February. I guess the question is if i dont get a period when should i next do a pregnancy test?