Far better is to wait - by 7 weeks you should see puppies moving around internally and if you let her go say 2 days beyond the due date and nothing happens, then have your vet x-ray. I've recently had an experience that more than ever proved to me the usefulness of scans. I had mated a bitch before lockdown and had 19 people on the waiting list. Some had waited 1-2 years and 3 were looking for assistance dog prospects, so there were a lot of people keen to know how things were going. We'd had two good ties and I had no reason to suspect anything but a normal pregnancy. Maiden bitch but proven dog. I thought the bitch was pregnant. She looked it to me, but of course I'd normally have a scan. What was odd was that this bitch's mother had started to gain weight. I told my husband several times that he must cut down on her food as she was fatter than her pregnant daughter. So he fed her less, obviously.
By the time the mated bitch got to 7 weeks I had buyers contact me pretty much every day, and I was starting to become a bit concerned. This is a large bitch, even for the breed, and I figured that maybe she carried just a small litter. The big worry was that there might be a single pup, and in this breed I know 4 breeders whose bitches were pregnant with a single pup and each ended up with a c-section and a dead pup. At the same time, I was starting to worry that the other bitch might be pregnant too! She'd not had a season for 18 months. Early March she acted a bit flirty but there was no blood and no significant swelling. To play safe the male dog that usually spent time with my bitches was kennelled.
I finally found somebody to scan both the bitches. I believed that both were pregnant. My husband was sure that the mated one was pregnant and the other had a phantom. We just didn't know! And we're not novices.
Turns out the bitch I had mated was NOT pregnant. At least that meant no risk of a c-section. But her mother, who we did not know had been mated, had not been wormed, had had her food ration reduced, and who is out of date with her eye test, SHE was pregnant. And due in around 4 days time the scanner said!
Luckily we had enough time to rearrange everything. The younger bitch no longer needed to be separated from the other bitches, but the older one had to be separated ASAP. We were very lucky in that she whelped 4 good sized, healthy pups (very small litter for the breed), and has not suffered at all by not being fed an approriate pregnancy diet.
Never again will I trust myself without a scan!