Work, getting to hard. Anyone else?

So I am 5 months pregnant and have had to change departments within my work to accommodate being pregnant. The further along I become in my pregnancy the harder it has become to work. A few weeks ago I had some spotting, thankfully baby is ok, but I feel like my body is telling me to stop before something goes wrong. It is hard to take the breaks I need at work so the pain can stop. I am having major back aches, tummy aches and knee aches. I am even considering leaving on maternity leave early. Just curious if anyone else is going through anything similar? If so, what did you do? TIA