Coming off the implant and TTC

Emma
Came off the implant at the end of Feb and started AF on 06/03 for 5 days. 
DTD in my predicted fertile window.  I'm now 5 days before my predicted AF. I've had massive headaches, cramps, bloating and fatigue. 
Did test yesterday and today and got BFN. Can I get pregnant straight after coming off the implant!? 
Ps taking folic religiously !