In the past when I had sex the sperm went always out of my vagina but now it doesnt. Can someone explain that?

I don't dare to ask my doctor but in the past when I had sex the sperm flew out of my vagina but in the lasts months (after I have lost almost 30 pounds) that happens anymore. Does the weight loss have any relation? Can someone explain that?In the past when I had sex the sperm went always out of my vagina but now it doesnt. Can someone explain that?
You should feel comfortable asking your doctor these questions, if not, maybe you should consider a different doctor.
But to answer your question, is it the same partner? If not, perhaps they have different volumes of semen (very common). How about exercise? Did you use that to help lose the weight or just diet? I don't think the weight loss itself has anything to do with it, but perhaps muscles all around are now tighter.
How did you loose the weight? If it was medication or any sort of tablets it may have conflicted with the pill or whatever you are taking to not become pregnant. Id be taking a pregnancy test or really asking your doctor.
Consider the possibility that your partner is ejacutalting.
In the porn industry that called a "CREAMPIE"