Im on a combo pill and

I'm pretty sure I just ovulated. I'm on cycle day 16 and yesterday and today I've been having slight cramps and lower back pain along with sore boobs (all over them) and red sensitive nipples.. any one have an idea? (Edited to reply) i take it the same time every day and have not taken anything that would mess it up and haven't had diarrhea or vomiting. It doesn't make sense to me that I'd ovulate but I'm having the symptoms for some reason. I have been on my pill since January and this is the first time I've had anything weird like this happen.