Hi ladies, wondering if anyone else had a problem getting pregnant after taking out my IUD 7 months…

Hi ladies, wondering if anyone else had a problem getting pregnant after taking out my IUD 7 months ago...I was sure it would happen right away but hasn't and it's frustrating ...I'm also not getting my normal monthly periods..when I do get it it's for a day or two and only when I wipe nothing actually staining the pad..I was reading up on this and found an article on implantation bleeding..has anyone ever heard of this?? Need help please!!