Spotting

So I’m on the pill and take it perfectly. I’ve been on this pill for about 5 months. My last two periods were super long and my cramps got worse. Also back in November, my nipples got incredibly sore for no reason. This month though, I’ve been spotting on and off and two of those days were pretty heavy that I think my period came early. Like I said, I take my pill perfectly and my boyfriend and I use condoms so pregnancy isn’t impossible but pretty unlikely. Could my dosage of pill be two low and it cause all of these symptoms and my body ovulate and not react to the pill at all? Or, even though I was spotting , were there still enough hormones in my system to supress ovulation?