pregnant and feeling bullied at work

[ereed]

im 25 weeks pregnant and I feel like im being picked on at work. i have only had 1 and a half days off sick and that was due to a horrible migraine. i return to work to be accused of faking it and told i was a liability.
now on my day off after doing a 13 hour shift i get a nasty text message from a co worker basically telling me i did a rubbish job. i was in tears at work yesterday cos i knew no matter what i did he'd find something to be nasty about.
now im dreading going back to work, its ruined my time off and its stressing me out.
what do i do?

If this is a co-worker then take a screen shot, then tomorrow see your manager tell them about the previous incident and show them the screen shot.
Regardless of whether you are pregnant or not if you are not doing a good job (not saying it is true) management should be discussing it with you not a co- worker.

Have you got a HR department? I would urge you to seek some advice from them. No one should be made to feel shitty and upset because of taking a day off sick.

Have you got a Company handbook? If so, read up on the grievance procedure. It may be you can resolve this by raising it with senior management, or, directly with your line manager.

The person who said you were a liability - was that your line manager? Or a colleague?

Start keeping a diary of things happening (date, time and any witnesses).

You need to deal with it and not accept the comments. You could use MN's classic response: "did you mean to be so rude" in response to nasty comments by your colleagues

Was your migraine pregnancy-related? If so, it cannot be held against you as this would amount to sex discrimination.
You are 25-week pregnant and you've done a 13-hour shift? this sounds unreasonable to me. Has your employer carried out a pregnancy-related risk assessment?
If you receive comments like this about your work performance you need to take it up with your line manager. If they fail to act, escalate it to your line manager's boss and HR.
You could phone Working Families and ACAS.