Boyfriend MIA all day and night 😑

Me and my boyfriend don't live together yet but hes mostly at mine anyway. He left for work this morning and said he'd be coming straight back from work. Haven't seen him since and it's now 7.20pm. I know that he's been with his friends all day and will be with them at his all night because if he was coming back he would have been back by now. So now i know i won't see him until tomorrow. He only does this once in a while, he's hardly out with his friends since getting back with me and it's like when he's with his friends he completely forgets about me. He has no phone anymore so he knows I can't get in touch and that I've been at home all day heavily pregnant wondering and stressing. he can't even come back to let me know where he is and if he's coming back today or not? It's so annoying and I just can't help but cry i just feel so uncared about. Is it really acceptable to leave your pregnant girlfriend at home all day and night going out of her mind wondering where you are and not get in touch at all? What if I went into labour and couldn't get hold of him? I've spoke to him every time he's done this and it's just not getting into his head clearly. Don't know what to do 😣 apart from this everything is perfect I'm so happy in the relationship it's just when he's with his friends. I don't know if it's a guy thing or I'm being too paranoid and emotional or what.. advice?