Maybe a dumb question

Brandy

Okay, so I’m a mom of a 10 year old, which in all honesty I feel stupid asking these questions! Lol.

But anyway, on the 2nd & 9th me and my fiancé did the deed and he didn’t pull out... now it says I’m supposed to start my period on the 20th. Which it’s normally right since I’ve been tracking it since November when I got the IUD out.. so I know you can test a day after missed period, but wouldn’t that be to short of a gap to know. ? I had a “thought I was pregnant” last month or so but turned out it was a bad test😢

So basically IF It’s to early would I still get my period? Or am I just plainly that dumb that should know already lol