Fingers crossed!!!

Gemma • I have 3yo twins from a prev relationship, hoping to have baby #3 with my wonderful fiancé. Been trying for 16 month xxx
Me and my OH have been trying since December 2013 to have my third(I have twins) & his first! 
I have had three early mc now and starting to loose hope! 
Conceiving has now become a challenge and goal I've set myself instead of being an exciting and enjoyable time! 
I've really considered going back onto the pill because I can't bare the heartbreak of a BFN or MC but I'm being so stubborn I can't help it! 
This month I've really researched and been tracking my CM ... Tested a little too early today 7DPO and came back with negatives 
What shall I do? Keep trying or back on pill next month?? Xx