Early signs?

Abbie • Married to the love of my life/man of my dreams. works at a drug&alcohol rehab. Loves reading, cuddles& tea
So my husband and I have been TTC for about 3 months now. I took a pregnancy test 3 days ago and it was negative, I took it around 5pm. While in the shower today I noticed my nipples seem a lot darker than usual and I can literally see every vein in both of my breast's and they are REALLY tender and sore.
Does anyone else think these could be early signs of pregnancy? I would also love to hear other early signs you may have experienced! Thanks everyone💗