Late period

Charity

I removed my iud (the copper one) the last week of April. Then a few days later started my period, it was very light. I haven’t had a period since then and I’ve taken multiple pregnancy test and a blood test that was all negative. From my research it says it could take up to 3 months before you have your cycle again. But I’m asking you all when I should be checking if I’m pregnant. Since I have no idea when I will be ovulating.