How many scans are typical during pregnancy? I had my 6wk scan for EDD and want to know how many more 2 xpect?

i had a scan at 12 weeks to check for any abnormalities then at 18 weeks to see how the baby was developing and yes they can tell at 18 weeks i was told they couldnt see any boy bits haha they wont guarantee it but i had a beautifull girl!