what do you think?

So....I have been TTC for a few months. My husband and I have my two boys from a previous relationship of mine but I'd like to conceive one with him. I love being a mom! I bought a shirt for him for his bday last month hoping I could surprise him but I didn't get pregnant and the shirt didn't ship until a week after his birthday. I had EWCM on Jan 18th and Jan 19th. Then on Jan 21 I had watery CM. My nipples have been very sore, sensitive, and tender for a few days now to where it hurts to wear a shirt without a bra which I always do and to where it hurts when my hubby plays with them. Could I be pregnant? If so when will implantation probably happen? Any advice?