Can Someone Please Explain This To Me

Okay so my period fluctuates (just a little bit) but this here eve app is pretty accurate on when my period is supposed to come. I had intercourse on my fertile days and on or after ovulation day (and sperm lives in a vagina for 3-5 days, right???) Late last week I was having slight lower abdomen and lower back cramps on and off for about a day or two, which I never experience at all before my period, since I’ve had children…cramps only ever happens when I’m pregnant. I’m on CD26 and my period usually comes around this time…..I’ve tested a few times late last week, it was negative, tested this morning, it was negative. It’s so weird because I’ve been having pregnancy symptoms. Now what is this? It’s like a creamy pink discharge when I was doing the #2 this morning. Could it be my period? It probably is 😞😞 oh well. Better luck next time I guess…