Need advice

Okay ladies so I am on day 3 of a late period I’m really hoping this is it because me and my girlfriend are not able to bd or have a known donor it’s not free for us to try. Of course I went to google to see what’s going on and it did say it’s common to miss your period but I haven’t missed my period in like years? Anyone had some advice? YES I did take test when I first missed it but was negative