tonsil trouble. HIV or tonsillitus?

Hello,
So my boyfriend and I of two years broke up for a little over a month, in that time he hooked up with his old ex girlfriend. Before when we were dating there was no problems or signs of any risk of stds and knowing his past history he seems clean. But last week we ended up getting back together, I gave him oral sex without protection but he didn't cum in my mouth. Then we had protected sex. He has absolutly no signs or symptoms of any illness or disease. Now over a week later my tonsils have become very swollen, sore and are covered in a white substance. I went to my doctor Yestarday which was the second day having this symptom and she tested me for strep which came back negative. She asked if I was sexually active and I told her yes and she asked about oral sex and I panicked and said that wasn't a worry. She then told me to go get bloodwork to test me for mono, which I had once already 3 years ago. For the past few months I have noticed little white chunks on my tonsil but no swelling or coverage like this. Is it possible that I just have tonsillitis or would that show up when she tested me for strep? Also would symptoms for HIV appear this quickly if that was unfortunately the case. She prescribed me a zpack and this is only my second day taking It with no big change. Thanks so much.