No, some people dont have an implantation bleed, it very much varies from person to person.
I didnt have a 'bleed' as such, I just had pinky/brown discharge for a few days after ovulation and had never had it previous months so it was a big giveaway.
But like I said, it definately varies so dont worry if you havent had one cos it doenst necessarily mean you havent conceived!!
Best of luck hun, hope you get your BFP soon xxx