My nipples have been very tender all day long. More sore on my left side than my right. My breast aren't sore, just my nipples. My period is due the 9th according to this app, which is usually right on or a day off. My cycles are always 28 or 29 days. So not perfect, but not bad. My glow says my most for the old day was the 24th and I was active the day before & day of. Does anybody think this is pregnancy?