Absolutely! The one trauma would have been enough to affect you, any one of those, but several, and it reinforces each time, particularly as they were all of sexual abuse. Alternatively, you may NOT have been too affected by the first trauma in relation to PTSD, but the other trauma's may have raised it, and caused PTSD. Or, if the first trauma caused PTSD, further trauma's will only add to it, and compound the thoughts, feelings, and beliefs around this. It becomes re-traumatisation to the first one, and also often seperate trauma events in their own individual right.
Personally, I also have several trauma's. There are many others here who also do, so you are not alone. PTSD, from one or many trauma's is devastating. Each and every one of us are affected similarly, but also differently as everyone has their own trauma story. For me, on top of the specific affects after each trauma, the whole host of them left me wondering why things like this kept happening to me. It left me feeling that there was something in me specifically that caused it. It made me feel like to have so many bad things happen of the same sorts of things, it can't be them it must just be me. It also made/makes it very difficult for me to deal with one trauma, as all are interlinked and connected. So I thank you for making me feel less like the only person it has happened to.... but of course, I wish things like this didn't happen even once to anyone.
Again, you're not alone -every single person on this board, whatever the nature of their trauma(s), will be able to relate to you, and you will be able to relate to, because we all feel affects of PTSD. It helps in ways individual therapy can't (though good individual therapy is a massive benefit obviously also). I strongly believe that, in some ways, the best experts are those who experience this first hand so you are in a good place.
Take care,
Lisa.