Fertility problem?

Victoria
Hey guys I am new to all this but after some advice. I have four children to a previous relationship and my partner has one to a previous partner also. I'm 35 this year and my youngest son is seven after I had my son I had the merina coil which I had taken out seven months ago since then me and my partner have been trying for a baby with no joy I have been trying to track my ovulation days but sometimes I am baffled by it all. I have never had this problem before I have always got pregnant within a month or two of trying. Me and my partner are both healthy eat well work out everyday don't smoke or drink much. Any tips guys I really want to be pregnant again.