My period is about 31 days apart, I had my period last month on the 23rd, it started with light pink spots then stopped, the bleeding returned the next day heavier, the bleeding only lasted for 3 days, 2 days after the bleeding stopped there was a light pink spot in my discharge,, I am sexually active,

Sometimes periods will vary a bit in their length, amount, and when they arrive. This is likely what you experienced, a slight variation.

If you feel pregnancy is a possibility, see what happens with your period this month, giving it some time to show up in case it is just late.