Following is a response from DHS staff member, Tom Pullum:
You could get the Stata code for the calendar (vcal_1) from our GitHub site but it's simple, so I will just paste it below. You don't exactly want the number of pregnancies, but the number of completed pregnancies, which are coded with a B for a birth and T for other terminations.
There is one record with an obvious error that must be dropped.
* Births, terminations, and completed pregnancies in the calendar (the past 5 years)
use "...IAIR7EFL.DTA" , clear
gen B=0
gen T=0
quietly forvalues lcol=1/80 {
replace B=B+1 if substr(vcal_1,`lcol',1)=="B" & (`lcol'-v018)<60
replace T=T+1 if substr(vcal_1,`lcol',1)=="T" & (`lcol'-v018)<60
}
* There is one record with T=59; drop it
drop if T==59
gen P=B+T
label variable B "Births"
label variable T "Terminations"
label variable P "Pregnancies"
tab1 B T P
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