TTC for 8 months

Hello!

Me and my SO have been trying for 8 months now to conceive baby #2. Well for me that is. He doesn't have any children yet. I follow all the aps and have sex on every single fertile day. I am starting to wonder of he is able to have kids. With my first child I didn't try to get pregnant and did. And also got pregnant a second time but miscarried. But with him I just can't seem to get pregnant. Anyone else haveing a problem conceiving even while following the apps?