Trouble orgasming

For some reason after I got pregnant with my son ( he’s 3 almost 4) I can’t orgasm through penetration anymore it used to be so easy for me and now I need to stimulate my clit or I have to grind the right way to cum at all. Has anyone gone through this? I really don’t know what to do but it’s frustrating as hell when I can’t cum anymore that way! I’m also 25 weeks pregnant and I’m super horny all the time and I just want a orgasm through penetration so bad 😭