OP, please ignore all the competitive "mightier than thou" posters, your needs are more important than theirs, or their past stories, or their axes to grind about how pregnant women should be treated, or their opinions about pfb.
OP if you have a problem with blood pressure don't go. Your doctor and midwife have an opinion about this no doubt, which we aren't privy to.
As you've said, you have said your goodbyes to your grandmother and I think you aren't expected to go.
Fwiw I was in full health, no BP problems, just a twinge of spd, and I found a funeral I went to at 7.5 months damn uncomfortable. Even though I didn't drive I found the 2 hours in the car, getting in and out, walking over the uneven ground in the cemetery, sitting on the pews was agony. As I said I did have a touch of spd.
The reason I went to the funeral was I hadn't got to say goodbye and I wanted to meet my cousins who were going as we live all over the country a d abroad, and I knew I wouldn't see them for a while.
I was exhausted after the funeral and my pelvis was very sore afterwards. I wouldn't have gone if I had been further along in my pregnancy. I went on reduced hours for two weeks after, and took the last month off as I couldn't walk long distances or carry anything. I think I could have stayed working longer if I had not gone to the funeral.
Don't go. You sound like you're a lovely dutiful person, but you need to put your needs first. You've said goodbye to your grandmother. No need to see how her remains are disposed of.
Just as an aside, in Ancient Greece women were never allowed to go to funerals, and especially were not allowed to go if they were pregnant. While I in no way advocate a return to those prescriptive taboos and controlling measures, I think sometimes customs have a basis in reality.
Apart from the super women who have answered (rather unkindly IMO) upthread and seem to have axes to grind, I think most people wouldn't expect you to put yourself out at such a time.
Imo being a feminist is supporting all women in all their choices, not just expecting them to soldier on and do what you did, even though the circumstances are different, or even if they're the same. This thread isn't the place to wave a banner for your agenda about pregnant women doing the same things as working women, or their rights etc etc.
OP You don't need to go, and I would consider this a start of you becoming more self centred about your self and your baby. You will need to flex those muscles, so start now.
I am sorry for your loss, I hope you aren't too sad.
I wish you the very best of luck with your little baby's safe delivery and early sleep deprived weeks with your new baby.
Please let us know how you get on?