Cramps and sore nipples

Mu

My run out date was 27th sept. I've had sore nipples and continous cramps for 3 days now. I'm currently taking vitamin b6 (50mg), maca 3000mg and ovacare. Is it normal or signify that periods are able to start. Whilst on the injection I'd get withdrawal bleeding every 2 months.

Please tell me it means something. It's been a while since i had such issues