Don't feel bad I be doing the same thing. I know it hurts his feelings but I believe its just because were pregnant. We haven't had sex for a month and I know the hubby is aggravated but I do try to explain to him it will get better after baby is born. I'm 30wks.
It is normal to have tightening or cramping after orgasm. Same thing happens to me. As far as why you are getting off quicker it is because of increased blood flow down there probably making you more sensitive. You should be honest with him. Maybe explain what happens after you orgasm and tell him you need a couple minute break after. You can continue stimulating him through other methods until the cramping stops, then continue. Some positions are more comfortable than others. You don't need to fake it, be honest with him. My husband and I have been through this 4 times, communication is key.
Be honest with him, if nothing is said, he might assume you don't want him, and that's much tougher to work through.
I'm 30+4 and us prego ladies have so much swelling and extra sensitivity down there it's almost too easy to get off (or not want to be touched at all).
If you're okay with oral, what I do is kind of put my arm over SO's waist and lean onto him from th side while going down on him (keeps pressure off the belly). This way he gets all excited and sensitive and he can't last long.
I also have him start very gently, that's a small space and no amount of lubrication makes the stretching any easier to deal with.
I don't usually get cramps after orgasm, but can you have him wait for a while after your first orgasm and see if you can continue after the cramping wears off? In the meantime, you can cuddle, or if you want to give him a bit of a hand job (no bending on the belly required) that might help hold him over until you're ready.
Join the crowd hunni!! Lol we all have or is experiencin it!!! n its simple!! Communication is key!!! This is definitely a great time to be open to tryin new things!!!! My second pregnancy i was exactly like u!! now im on my third pregnancy with twins n i have figured out ways n methods that a bothe pleasurable for both me n him!!! N now i cant keep his hands off me!! Lol!!! Foreplay is key as well !!we as woman wanna feel sexy and wanted!! So foreplay is definitely a key component n keepin u involved!! N let it build up. U dont have to have sex everyday!!! play the waitin game for a few days!! that will help!!!Have fun!!!