I'm still feeding my daughter at 2 years and 8 months while pregnant. She loves it and says they are 'hers' and her 'best friends' haha. She feeds occasionally in the day and when she is chilling out on my phone for comfort and also at night. I find the initial latch sore since I've been pg, but it eases fairly quickly.
I thought I'd be more tired still bfing, but despite having hypothyroidism and low iron, I've not felt too bad considering. I don't know when I'll be weaning her off, unless she does it herself, but I'm not going to feel pressured to do so. My mother-in-law asks occasionally, but she's said before now she'd have found it too embarrassing to breastfeed beyond a year, so we are two different people in that respect.
I'd advise getting all your bloods and levels checked and monitoring how you feel. If you feel that continuing to breastfeed is detrimental to you, it may be worth weaning. You've done amazingly feeding for so long and need to take care of your health and baby as top priority. If you feel better, do what's right for you and your little one xxxxxxxx