Sore nipples

Lindsay • Married to a man in uniform!!
Okay so me and my husband have been trying to get pregnant just this month. I haven't missed my period yet. I'm suppose to get my
Period Feb 10th.  But for the last week my nipples are so sore. Not my whole breast just my nipples. Which close to my period my whole breast would hurt but this is different it's just the nipples me and my husband did have sec and bite on them but I didn't think he did it that hard we been trying 2 weeks now and my ovulation period was a week ago so it may be soon to even have this as a symptom I was just curious could this be from him sucking or can this be a pregnancy symptom? I'm all new to this never been pregnant and any tips on how to relieve it? No mean comments please thanks ladies!