This is a particularly busy time of year for all councils but the statutory notice period for issuing a summons to a meeting is three clear days (clear days being defined as excluding the day of the posting of the notice and the day of the meeting). So, for example, if your meeting is held on a Friday your notice of meeting should be issued on a Monday. Note that Sundays and bank holidays aren't included as "notice" days and whether Saturdays are included is a bit of a debating point but most don't include Saturdays either.
If you are newly elected, your clerk may be struggling to get your contact details. Immediately after the last set of elections, clerks were complaining that their elections office weren't divulging addresses and contact details under for GDPR purposes until after the election date (whether contested or not) so it might be worth contacting your clerk just in case that's happened there too.