Will it ever happen? Is there something wrong with me?

Before I start I would please ask not to judge me on my choices and how I've miss led people... I've been unwell mentally and haven't thought things out very well.. 16 months ago I had my implant removed to have a baby with my partner who I was with for 7 years.... unfortunately I had a bit of a break down spilt up with him made myself homeless and very unwell.. I haven't even really thought about any of this until today.. I have had unprotected sex with 3 different guys ( not all at the same time) since my spilt up and I haven't fallen pregnant ( obviously a blessing at the moment) but I do want children one day and is this luck or something that isn't set out for me.. I find it odd how I can have sex roughly 3 times a week every week for 16 months and not get caught... do you think there's something wrong with me? ( I would like to point out I'm now better and I'm back on the implant.. and it wasn't me trying to get pregnant it just never entered my mind.. got robbed into drugs and alcohol-- which I'm now off; it just really didn't come to Mind till now)