Advice on a friend I think lied about a miscarriage?

This is a long post but please read and give your honest opinions!

So I have this friend... she is a very good friend in most respects and was even a bridesmaid at my wedding... Two years ago she claimed to have had a miscarriage but I think she might be lying and I don’t know what to do. It was two years ago but now I’m pregnant she keeps bringing it up all the time.

For the last four years she has been having an affair with a married man who really dicked her about (don’t judge). She got quite messed up by the whole thing and started having a bit of an issue with alcohol and just general drama.

Halfway through the affair she ended it and started dating a guy she met online.

They had maybe three or four dates over a couple of weeks. She rang me on a Wednesday to say her period was late and she was freaking out. She said she had taken a test and it was positive. She sent me a picture of the test. I told her to bring the test and the box to work (we work together) so I could double check to make sure she hadn’t read it wrong in her panic. She came into work and said she’d forgot the test (first red flag).

She booked a doctors appointment for the Friday. I offered to go with her to the doctors. She was being really evasive about what time her appointment was and which doctors and then at the last minute she said the guy she was seeing was going to go with her her.

After the appointment she said that the doctor’s pregnancy test came back negative and that the guy thought she was making it all up. She said it’s because she’d been up worrying all night and had drunk too many cups of tea. I’m pregnant myself now and I did a very early pregnancy test in the evening after drinking loads of water and it still came out positive so IDK about her story.

Anyway she got home and did a home test and it said positive. She tried to tell the guy but he had blocked her on all social media and wasn’t answering her calls.

The following Monday she called in sick to work, saying she was having a miscarriage. I offered to come to the hospital to be with her but she refused. She then said she was going for a scan as they thought it might ectopic. Now she would have only been a couple of weeks pregnant at this point and I’ve researched this- most of the time you don’t know you’re ectopic until about ten-twelve weeks. So I doubt they would be scanning her so early for an ectopic.

She was discharged from hospital the same day and was signed off sick on the Tuesday. On the Wednesday all her co-workers from her team were doing a day trip. She didn’t go, but I found out later she collected some of them in the evening and then went out drinking with them and got smashed.

She told me not to tell anyone about the miscarriage but over recent months I’ve found out she’s told pretty much everyone we work with any way.

One friend said she rang her and said she was having a miscarriage but she was outside. When challenged, she said the hospital had let her leave to pay for more parking on her car!

Another friend got the same photo of the pregnancy test but checked and found it was a stock photo from Google (I found this out much later so wasn’t able to check as I didn’t have them original photo). The background of the photo was of a grey counter top but she has no grey counter tops any where in her flat!

So she went from having a missed period to having a miscarriage in the space of a week basically.

She has since said that she knew she was pregnant the same day and her hand kept going to her belly without her realising. I joked that she must be the only woman with that sixth sense cos I was five weeks before I knew and she then said she had actually been ten weeks pregnant when she miscarried.

I never asked her any more questions because I was pretty cross at this point and I still can’t figure out which was the lie? Or if she miscarried at all?

Did she get pregnant with the married man and lied when she started seeing this other guy to make it seem like it was his baby? Or did she just forget everything she told me and just lied again about being 10 weeks?

I have no proof she is lying but there are loads of red flags in her story. Of course I’ve been sympathetic and supportive but I am finding it hard to carry on being like that when I have this niggling feeling that it’s not the truth. It’s upsetting me because she keeps referencing the miscarriage when I talk about my pregnancy and it makes me feel really awkward, like I can’t enjoy this special time in my life with my best friend.

What should I do?