Blinking smiley faces 1day before period

So right now I’m 13 dpo I’ve been having lots of back ache and cramps sharp pain come and go through boobs since 3dpo I’m just wondering 5/6/7 blanks 8dpo I got a solid smiley face then blank on 10dpo day 11/12 and on day 13 getting blinking smiley faces period due tomorrow y am I getting blinking smiley faces could it be pregnant? Did anyone else experience this