Birth control pill

Jenny

So I’ve been on the 21 day pill since August 2018 and I’ve had my periods like normal. But maybe like a week after my period, I would spot for another week. But it would be light and then heavy and so on. The last Norma period I had was from Dec 3rd-7th. And since then I’ve just been spotting off and on but light. When I use the bathroom, there will be just a light red color on the toilet paper but just no blood in the toilet. And then sometimes they’ll be a dark red color, medium-big spot in my underwear. I was suppose to get my period in the beginning of January, but I haven’t gotten anything. Just the spotting I’ve been having. Is this normal to have while on the pill? I’ve never been on birth control ever in my life. So idk if my body is still getting used to being on the pill. I just had my daughter in June 2018. I would really like to know if anyone has had this problem. I know I probably should just call my doctor and ask her.