Question/Concern

Laura
I have a question/ concern. I have been TTC for a while now, I just had my period on February 4, so it has been about 20 days since the last day of my period. I have irregular periods, but usually have it about every 40-45 days. However, it's been about a week that my breast have been very tender. Even putting on my seatbelt bothers me. I did take a pregnancy test this morning and it was negative. Any advice?? I don't know if this might be a sign of pregnancy or if my mind is just playing games with me. Any advice would be much appreciate it! Thank you!!