They won't only pregnancy.
I don't think lamb skin protect against HIV
If timeless2 advice doesn't help,then try condoms made of lamb skin
You can develop laytex allergies at anytime. Different condoms also can have different materials. So it could be the brand. Take a look at the condom box then go look at a box of condoms that you have not had problem with. The box will have any additives. good luck