No friends now

Just venting: I didn't realise how alone I'd feel once I got pregnant. I can't blame my friends. They have their own lives but they never invite me to things anymore. I've never turned down an offer to hang out, if i did I'd understand why they'd stop inviting me. I'm young, yes (almost 20) and my pregnancy wasn't planned. Despite that I'm insanely excited and my friends seemed so excited and supportive at first too! One of them even started making me a scrap book! but now anytime I ask if theyre busy they say yes, then awhile later I see things on social media where they're definitely not and hanging out together or doing something. maybe its me. maybe im unbearable and just don't realize it.. I just wish they'd tell me the problem because I really need my girl time again:(