Minimal Bleeding, Period Is Due, Taking Birth Control. Had Salpingectomy Due To Ruptured Ectopic Pregnancy

Hello, I had a right salpingectomy due to a ruptured ectopic pregnancy in May. I began taking birth control about a month after and had a normal menstrual cycle last month. I felt cramping and the flow was heavy to normal. My period is currently due, and I noticed very slight bleeding last night and expected it to increase as usual, but it continues to be very minimal, almost nothing. I am wondering if this is what I can expect going forward, will my cycles alternate and show different symptoms every other month? Thank you so much for your help!