Please please please address the biggest issue here - the feeling / assumption medical staff 'tell you' what you can/cannot do. Its your body, and YOU must give CONSENT to anything. This attitude is so pervasive and its horrifying that so many women talk about their medical choices as if medical staff get to decide and they don't need to give consent (sorry rant over! Just hate the idea of woman walking around feeling unempowered!).
I'm on my second pregnancy, both after success FETs. I was advised by consultant to induce at due date with my DD, told him politely absolutely not as no medical reason to do so other than method of conception. I had a very easy pregnancy, no medical issues with myself or baby. I declined all interventions (no sweeps etc) and went into spontaneous labour at 41 weeks. I wanted aa non-medicated labour as possible, so used birthing pool and gas and air. Eventually moved to a (non-emergency) forceps delivery due to a long labour and long pushing stage. I'm very pleased with the choices made throughout. This time around consultant has been far less pushy about induction as knows my views. We're currently planning for a home birth, as again there is so far no medical issues with myself or baby.
I've had additional growth scans in both pregnancies due to method of conception. Research is interesting actually, as last time I looked whilst there was evidence that babies born from fresh embryo transfers were on average smaller than babies conceived naturally, actually babies born from frozen embryo transfers are on average larger than babies conceived naturally.
I think as with any decisions in pregnancy you need to look at your own circumstances and risk factors. I feel confident in waiting for spontaneous labour, but I'm in my mid 30s, have no medical issues, and used IVF due to needing donor sperm. I've had 1 easy pregnancy with no complications, and a birth with minimal issues. My DD was 8lbs 7oz. In my current pregnancy, again there are no known medical issues, and this baby is currently following same growth trajectory as DD, so I'm assuming will be of a similar size. If my personal circumstances were different, and risk of complications higher, I might very well make different medical decisions.