Hello, sorry this is long but I needed to explain my situation and need answers!

So I'm 21 years old and kind of worry about everything so I am looking for answers. I have been on Yaz birth control for year and half now, everything has been great. I have never missed a period and have never missed taking a pill. I have my pill schedule so the day I start a new pack is when I spot, and the next day I start to bleed. That is how it has been for all time on pill. This month I began to spot normally the day I was supposed to (when started new pack) but I never actually bled. I had no discharge the next day, had brown discharge the following day along with a drop of blood basically, and brown discharge on final day.

I am sexually active (same guy I've been dating for years, we've both only been with each other) but along with my taking the pill, he wears a condom and pulls out, so I am very doubtful of pregnancy. I have been having abdominal pain, but that is not unusual. I have been having that pain for 6 months now and many medical tests have ruled out digestive diseases, etc. so I am just dealing with it. Other than my normal abdominal pain, I feel fine. I want to say I missed my period months ago due to being sick but can't remember.

I have read that some women taking Yaz correctly just get lighter and lighter periods until eventually they just stop? Can that be my case? My periods have been lighter and lighter.

Can anyone give me some insight on what is going on? I will wait a month and see what happens, then go to doctor if irregular again, but just wondering in the meantime.
Thanks

I'm on Yaz, but only for a month now, just started my new pack a week and a half ago, and I've had the brownish discharge too. It's the type of blood that occurs usually at the end of my period but it's been over a week of that now, just not a ton. Panty liner covers it. I actually just posted the same question

Ya, I was actually just wondering if it can just be dried blood. When I had this I was so busy during the day I wasn't using the restroom all the time so I could have bled a little and it could've already dried. That is another option. But I do like Yaz, it's really helped me with everything.