The best replacement for period is implantation bleeding.

The best alternatives to period are rated as following:
★★★★★  implantation bleeding
★★★★★  spotting
★★★★  miscarriage
★★★★  frequency
★★★★  pregnancy
★★★★  pregnancy symptoms
★★  pregnant
★★  group
★  implantation
★  amplitude
★  wavelength
★  pregnancy cramps
★  full stop
★  pregnant bleeding
★  breakthrough bleeding
★  pregnancy spotting
★  sensitive period
  cycle
  implantation cramps
  blood in urine
  pregnancy bleeding
  popped cherry
  comma
  sentence music
  family
  appendicitis
  pregnant spotting
  length pendulum
  implantation bleed
  victorian period
  signs of pregnancy
  implantation spotting
  poop stain
  abnormal period
  early miscarriage

Your alternative for period is not listed? Suggest!
Speaking about period, one probably shouldn't forget about pregnancy.

Other search terms related to period and their ratings are:
★★★★★ pregnancy
★★★★★ clots
★★★★ ovulation
★★★★ cramps
★★★ bleeding
★★★ no cramps
★★★ blood clots
★★★ blood
★★★ iud
★★ mirena
★★ birth control
★★ brown blood
★★ no blood
★★ no ovulation
★★ symptoms
★ ectopic pregnancy
★ quotation marks
★ sore breasts
★ uterus
★ ovulation signs
★ spotting
★ no symptoms
★ pms
★ ovulating
★ nausea
★ parentheses
★ depo shot
★ clots pregnancy
★ uterine lining
★ paragard
★ lots of clots
★ no bleeding
★ implanon
diarrhea
cramping
blood flow
pregnancy symptoms
large clots
negative pregnancy test
cramps pregnancy
uti
clots normal
tampon
huge blood clots
provera
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Google Trends

Scale is based on the average worldwide traffic of period in all years. Click on graph for more.
period
implantation bleeding
spotting