Period due 3 days

Long sorry but I'll cut it short, I been ttc since 2014 ny period is 26 days I ovulate day 12-13 every month without fail, I had a blighten ovum in may and had 1 period since then and I'm due my 2nd period in 3 days, this month is different I usually spot around 5 days before my period like scanty and light, expecially if i have sex as my cervix is low and that is what cases the bleed, but this month my cervix is still high I haven't had any sign of blood atall and I normally have tender breasts about 5 days before af but their not hurting atall my nippes are just tingling, I hope this is my month I just feel like I'm not going to get my period, when should I test, my pregnancy with my son was totally different I didn't find out untill i was 8 weeks as I was on the implant so the line was so strong