When to take a pregnancy test?

Okay so I've had an iud for about 4 years and just recently had it removed last month on the 10th then started taking my birth control (pill) the very next day but my bf came inside me on the 20th of November and now it's been about 8 times that's he's came inside me were kinda hoping for baby number 2 so I right away got off the pill so my question is when do I take a pregnancy test?