Could I be pregnant?

My last cycle started around June 12th. It lasted about 2 days. I'm super irregular. Usually months between.

The last few days I've had severe pain in my breasts. And my nipples have been huge. I feel sluggish but can't sleep more than an hour at a time. I've also had a lot of gas. My CM is milky looking. I've taken a test and it was negative but I'm not sure what else it could be