Enlarge (credit: areeya_ann | iStock / Getty Images Plus) With abortion access becoming more limited throughout the US, demand has spiked for emergency contraceptive pills that can help prevent pregnancy up to 72 hours after sex. This week, in an effort to maintain supply, Amazon joined retailers like CVS and Walmart by placing temporary limits on the number of “morning-after pills” that can be purchased. CNBC reports that Amazon customers will be capped at a maximum purchase of three units each week of emergency contraceptive brands like Plan B, which is the most widely available option.