The documents add up
With two coverages, the papers for a step are added together rather than intersected. The intersection sends you to the queue missing papers, and that queue is only worth standing in once.
What comes next
Your pregnancy, ordered by whoever covers you
It is not a generic calendar. It is the sequence of procedures that applies to you, with the window each one usually happens in, what to bring and the regulation it comes from.
5 steps with IMSS.
Open a record at your clinic
Usually between weeks 6 and 12
Bring:Official ID, CURP, Proof that your coverage is current
Source: IMSS — Guía de control prenatal
First prenatal appointment
Usually between weeks 8 and 12
Bring:Prenatal card, Previous test results, if you have them
Source: IMSS — Control prenatal
First-trimester lab work
Usually between weeks 10 and 14
Bring:The order from your appointment, 8 hours fasting
Source: NOM-007-SSA2-2016
You are here
Anatomy ultrasound
Usually between weeks 18 and 22
Bring:ID, Appointment booklet
Source: IMSS — Guía de control prenatal
Filing for maternity leave
From week 34
Bring:Social Security number, Medical certificate from your UMF, Bank CLABE for the payment
Source: Ley del Seguro Social, art. 101
A mock-up with example data, at week 20. In the app the week is yours.
A window, never an alarm
If a step has passed, the app tells you "this procedure usually happens between weeks 18 and 22". It does not say "you are late" and it paints nothing red: the tone of urgency belongs to whoever is caring for you, not to an app.
You check off what you have done
You mark a step as done and the path moves on. If you got it wrong, you undo it: no record is kept of you having failed at anything.