When should I test?

Help me! It’s my first time trying to conceive. I came off microgynon (uk pill) 5 months ago. I have cd of 28,28,30,31. They have been pretty regular and I always know when I’m due on. I am currently on cd33. I’ve had back pain, stomach cramps, nausea, dizziness, my nipples are larger and had a funny taste in my mouth. I’ve had this all for 5 days now. I did a test on the day I was due my period (3 days ago) but it was negative. I am unsure when I ovulated as I decided not to test this month due to it stressing me out. When should I test again if I don’t come on my period? Anyone else experience this?