Was this likely a false negative pregnancy test? Could I still be pregnant?

I'm 3.5 months postpartum. I had my first postpartum period December 6 (first day of it). It lasted the usual length and the flow was like usual.

I've only been using the pull out method to protect against pregnancy. I know a few times some sperm may have gotten inside my vagina. My boyfriend has been c*mming out the outside of my vaginal area (the vulva and labia areas). He usually wipes the top off before going back in, but he usually has pre-c*m starting when he first goes in.

I have not gotten my period yet for January. I have been a little moody and more emotional lately (I had these symptoms early in my first pregnancy and I don't get these as a usual PMS sign).

I took a pregnancy test today for the heck of it. I didn't use my first urine of the day and the pregnancy test has been in the trunk of my car since like May and it's been cold outside lately because it's now winter. It as a digital test. It came up not pregnant.

Could this be a false negative since the test was out in the cold? Could it be too early to test? Could I still be pregnant?

Was this likely a false negative pregnancy test? Could I still be pregnant?
Post Opinion