Seems like it comes down to whether your gp is supportive or not! DS was through IVF so a scan at 6-7 weeks was routine. This one was natural but I asked my gp for a referral for a scan at six weeks for peace of mind and she was happy to do so. She called it a dating scan so I could claim some money back from Medicare but we were out of pocket a couple of hundred dollars.
I would just ask your gp for a referral and tell the truth, worst he can do is say no.
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