20DPO

I’m wondering if it’s possible to be pregnant still. I’ve taken quite a few tests and spent a small fortune and some looked like they could’ve been positive, others completely negative. I’m still getting twinges and the veins on my boobs are sticking out which I’ve heard is a pregnancy symptom. I’m always queasy especially in the car and can’t stop sleeping or eating. I did have a bleed with clots in but it’s a a whole lot lighter than usual, spotting so light I didn’t need a pad on day 1, a thin pad day 2, panty liners day 3 and nothing day 4 (although I wore a liner to be safe). My boobs have been on and off achey the whole time and I don’t want to spend more on yet another test if I don’t need to. Usually so heavy when I bleed with awful cramps. If I tested today, at 20DPO that’s certain right? Or should I just not bother?