Pregnancy bladder qustion!!!

I've been struggling with constipation throughout this pregnancy (5months) and today when I was on the toilet I was pushing and just decided to wipe myself and felt a HUGE bulge! It's not hemroids, but more front like around my vaginal but slightly back. I guess my perenium. It's bulged out ginormously! If I don't push it's back to normal. Is this ok?! I see my Dr on the 9th and will bring this up, just wondering if anyone's experienced this? Also I've always have what I thought was a lot of discomfort in my lower abdomen and bladder. I figured it was just a normal pregnant thing. Now I'm wondering if this means something else.