I don’t know what to do, I need help

So, my SO and his entire family want to go on a cruise next year (well 2019 so about a year lol) . Yeah, don’t get me wrong, I would love to go on one but there’s a couple catches:

1) it would cost about $2000 and that’s a lot of money to me, for the same price I could plan almost an entire trip to somewhere in Europe... instead of being on a boat

2) we would be with his entire family, including his brothers girlfriend who is literally Satan (and now she’s pregnant and can’t stop rubbing it in my face), his Aunt who is never happy with anything & his grandma who does anything for attention (I’m not kidding this woman thinks she’s allergic to diesel fumes).

3) we are trying to have a baby, I have PCOS so we are already having enough trouble with everything. His mom doesn’t understand why I wouldn’t want to go (she doesn’t quite get what PCOS is and doesn’t want to admit we’re trying to have a baby even though we’re adults who have a house and good jobs), $2000 could literally pay my bills for 2 months for maternity leave.... I can’t drink bc my meds make me sick as shit & that’s the package they’d get....

Idk am I just being a raging cunt about this, or am I making sense. Because he just keeps saying I’m being negative & blowing me off like this doesnt matter..... we also have a dog so WTF am I suppose to do with him, my pup is like my baby. Help me please.

Update: uh for those not actually giving me advice and worrying about how much a trip to Europe is... I just found tickets for $800 round trip (for 2 people) so how about we just don’t argue about something irrelevant. Thanks.