No period

Hello,
I'd like a bit of advice as a newbie trier. I came off the combined birth control pill in April and had the residual bleed. About 2 months later I had brown spotting for two days but that was it. Now I'm another month down the line and nothing. I have taken ovulation tests which all come back negative and also took a pregnancy test yesterday that was negative.
Anyone know what could be going on? Do you think I should go to the doctors?