Is an Employee Improvement Plan really to help or am I about to get fired?

I always liked my job and felt I worked for a good company who does care about their employees. I’m the only AP clerk in finance. In my opinion, I was surprised by getting a PIP last week. I knew that I was making a few mistakes every now and again, and my coworkers would let me know said mistake, but it never seemed like a big deal and I was never formally sat down by my manager to say “hey, you need to fix this that and the third” We have yearly employee reviews and ours was in June and I did get “needs improvement” because one or two columns were marked that way, and my manager said about little mistakes but that was it and I haven’t heard anything from her since then, just a staff accountant letting me know if there was a mistake.

Don’t get me wrong, some of the things on there are legit mistakes and I should’ve paid better attention because when you’re coding an invoice with 25+ lines it’s easy to mix a line up, but some of the bullet points of things wrong on there are things that are caught in the process, ex: if I put a wrong code on an invoice, before it is transferred the whole way through to ERP, one of the staff accountants jobs is to look and make sure coding is correct. There was an instance I added an additional cost line to the PO, and coded it all to freight but there was taxes included in there, accountant caught it and sent it back to me and I fixed it. Nothing was finalized and it’s her job to check them. Another is when paying invoices, I have to manually type a cover sheet with each invoice amount & number and add it up, I put the wrong amount for one of the invoices and the staff accountant let me know the wrong amount was there and I fixed that before payment was sent. But again, I know it was a typo, but it’s literally the staff accountants job to check and approve these things before stuff is sent.

Another is an expense report that an employee submitted but I didn’t process until 3 weeks later. This employee did submit report, but didn’t submit receipts so I couldn’t process it.

My “paid” invoices that needs filed in filing cabinets has been piling up for a few weeks now, but my manager was made aware of that and told me to ask one of our temps for help. We still print every invoice and I’m finding out now that a lot of companies don’t do that anymore. Sometimes that causes me to print a duplicate and pay an invoice twice as well.

In the expectations, it says no payment errors at all in the next 60 days. This includes the summary sheet I type up manually with invoice amounts (that the staff accountant checks). It says I need to file invoices weekly, which like I said manager was aware I was behind anyways. I told her I have too much to do. We have been getting 700-800 invoices a month plus 45 employee credit cards that I need to reconcile. And we’re working on a project to try to eliminate us manually doing expense reports. It also says I need to empty the invoice folder every other day, which is a surprise to me because I empty it daily anyways. We’re supposed to have weekly meetings on my progress, I plan on telling my manager that some of my work needs reallocated because I have way too much and sometimes that makes me rush to make sure everything is entered by month end.

I know I make some mistakes, but I never thought it was THAT bad to where I needed to be placed on an improvement plan. I’ve seen others say the plan is just a way for them to fire you. (I am in an at will state). My anxiety is really getting the best of me right now and I’m pregnant due in March so this is the worst time for me to be more stressed. Is this plan really truly to help orrrr am I likely about to be fired?