Welcome back to the forum.
First, no matter how "odd" your partner might be, the chance a 40ish heterosexual male in So. California has HIV is very low. Granted he could be lying about sex with men or injection drug use, but probably not. Second, even if he were infected, the odds of catching HIV even with unprotected vaginal sex to completion averages about once for ever 1,000 exposures. With the brief penetration you had, it would be far lower than that.
So all things considered, I would put the chance you caught HIV from this exposure at zero for practical purposes -- certainly no higher than one in a million.
If that level of security resolves your fears, then no testing is needed. But my guess is you'll need a negative test result for reassurance. You don't say exactly when all this occurred, but I have the impression it's been at least a few weeks -- i.e. enough time for reliable testing. Feel free to let me know the result if and when you do it. While your'e at it, also have a urine or vaginal swab test for gonorrhea and chlamydia (the risks for which are also low, but much higher than HIV) and a syphilis blood test. I anticipate all results will be negative, but better safe than sorry!
I hope this has helped. Best wishes-- HHH, MD
Yeast infections (thrush) are not known to increase the risk of HIV. You definitely did not make "a huge mistake" by resuming sex with your boyfriend.
Let me know your HIV test result. I'm confident it will be negative, so stay relaxed in the meantime.
Thank you for your quick response. It has been about 10 weeks since all this occurred so I can test. One other question I did have, is I am prone to thrush. If I had thrush at the time this occurred, does it increase my chances of having caught hiv? I will definitely test for the other more common stds. So you don't think I made a huge mistake in terms of my current boyfriend by having unprotected sex with him? I have not put him at any real risk?