"Small problem"

I am so ashamed that I've turned to this type of outlet in order to express some very real and very personal issues in my life. Please be kind and gentle with your feedback. So- my marriage is wonderful. I feel like I hit the jackpot with my husband. He is smart, loyal, FUN, charismatic, sexy, cooks, cleans!!!!!, and is the best friend I have ever had. However....he is also the smallest I have ever had. It bothered me at the early stages of us dating but I fell in love with him and fell in love with his member as well! Still though, sex is a challenge. We are limited considerably in positions. Doggy and me on top are about the best. I'm also 8.5 months pregnant. Cross doggy off the list for us now. Too uncomfortable for me. Now on top hurts him! Says he feels like something is poking him up there?? I'm at a loss. I NEED sex. Sex has always been much less important to him. I've discussed this with him multiple times and he says I put too much pressure on him and make it hard for him to perform. Can anyone out there relate at all? Or offer any advice? Positions? Anything? I am 25 years old and a very sexual person! My husband is a bit older but clearly doesn't have the drive to keep up with me or, quite frankly, the equipment. I love him so much and feel terrible for even sharing this with strangers. I am just at a complete loss.