3 days late

Hi,

So I'm 3 days late for my af and I took a test this evening but it was negative.. I'm normally on time when it come to my af so this is odd for me... tbh I didn't think I would conceive this month as we BD after my fertile n ovulation time... but I notice I had ewcm the day was BD and we BD again after that.... also today I had milky cm when I went toilet but bcz ive started getting slight cramping this evening for a bit and pain on my left side when i was laying on my stomach I'm just thinking maybe my af coming ...