When should i test?? Help!?

Victoria 🍦

Hi im Victoria I'm 19 , i have a 2 year old son and im currently ttc for my second 😊So last month Dec. 5 I had my first period off the birthcontrol pill and it lasted until the 15th we've been TTC ever since ive been off my period . Tomorrow will be 3 weeks since I've had my period but I don't know when I should test?? I'm so impatient lol

Update: writing on here so don't have to reply individually , before having my first son I was irregular and after I had him I was on birth control for 1 year my last period on the pill was the first week of November then I spotted for 3 days a week before my actual period so I know I have to give it time to actual know how long my cycle length is and when I'm ovulation but after I finishedy period I did notice white discharge not sure if it was just regular discharge or I was ovulating it was on going for a couple of days and we've just been ttc ever since.