Curious about my period on the pill

Kaitlyn
I started taking the pill in October of last year. I wasn't having sex (hadn't since March 😒) and I wanted to regulate my period as well as be prepared for when I started having sex.
I started having sex again this month. (2017 is starting out great!😏) Now, my period (I think?) started Sunday. But it's so light! I've never had spotting before. I'm not sure if this is a light period or spotting. It's Wednesday and I'm still bleeding, but it's gotten just slightly heavier.
Is it normal for your period to change after becoming sexually active after being inactive for some time? I plan on going to the doctor to get tested and ask about my period soon, but for now, can anyone provide some insight?