2nd period πŸ™ƒ

i just finished my second period and curious to know if period cycle goes back to normal after having the first period after pregnancy.

I like knowing when is my β€œmost fertile” time so my husband and I can be extra careful because I do not want to get pregnant again πŸ™ƒπŸ™ƒπŸ˜­ my cycle was always very on time