Danilou22 I know nothing about the Cambridge diet and don't want you to think I'm shouting . But I feel I must caution you - if the diet involves eating barely anything then that might be very bad for ttc.
I'm the opposite of you gals - up until recently I maybe ate one meal a day (dinner), and was casual about it because I am ideal BMI for my height.
But my scenario is not as good as it may appear: my one meal a day was giving me crashing low moods, headaches... all this I think affected by sugar levels, which affects insulin, can trigger cortisol, which makes you feel more stressed than you should (and TTC is stressful enough), which affects progesterone, which affects ovulation ... etc. I've had two MCs (maybe as a result of this...?), so was desperate to get my body in order.
What I've done is gone to see a nutritionist and I found one who specialises in fertility. It was not cheap but I wish I'd done it ages ago.
I was gobsmacked by how much she said I should eat. Three meals a day and snacks, aiming for 5 portions of veg plus two portions fruit a day (yup, 7 a day - not 5).
I was convinced I was going to pile on the pounds after years of hardly eating but the opposite has happened. I've lost a bit of weight, and I've noticed my 'muffin top' shrinking. But lots of other good stuff too - my skin is looking better, energy is good, moods so much better its unreal ... Must add that she's also got me on a bunch of supplements. I'm blown away to be honest, that I can eat that much and not put on weight and it has had such a direct impact in such a short space of time.
Sorry if this sounds super-lecturey-preachy. I'm honestly not critical of other people's choices ... but I know TTC is something you care about, which is only reason I'm saying this. Be careful hun - or at least run the diet past your doctor or a nutritionist before you do anything that might make ttc harder.