Help ?

So I ovulated 6/4-6/10 , had intercourse on the 7th . But period is due 6/25 but I had spotting 6/19 & today the 20th just when I wiped . Also breast really sore and had like clear discharge . No cramping or anything , been feeling nauseas and cautious when it comes to certain foods . Also my lower back and thys have been really sore .. Took a preg. Test bout a week ago was neg, but also to early.. Idk what's going on ? Has anyone experienced anything similar ?