Was on implanon got it removed

I was on implanon but got it removed 2 weeks ago. I was ovulating at that time and we were trying befor and after the removal. I've taken 2 pregnancy tests and they were both negative. I'm starting to wonder if I'm infertile because I had the implanon for 4 1/2 years and was only supposed to have it for 3 years. My fiancé doesn't have any children and we both want one. I already have 2 kids but I want one more. I'm becoming depressed about it and I'm scared to ask a doctor because I don't have the money to find out wether or not I am infertile.