Pregnancy after IUD removal?

I was wondering if anyone here has gotten pregnant soon after getting their IUD removed? And if so, how soon was it?😅 I had the Mirena IUD for a little over a year. I got it removed about 5 weeks ago because I didn’t like the side effects anymore so just over a month, my bf and I have had sex 3 or 4 times since then (unprotected) and one or two of the times he did not pull out in time so a little bit came in me. My period is now 4 days late according to my period app but I’m not too sure how accurate that is since I just got off birth control, my OB told me it could be a while until I have another period so idk. We definitely aren’t necessarily “trying” for a baby but aren’t preventing it either. We already have a 16 month old and honestly would not mind another if it were to happen as we’ve always wanted our kids relatively close in age. I took a pregnancy test almost a week ago which was negative but I will be retesting since I’m now apparently late. When would be the best time to re-test?