Congratulations on your pregnancy OP!
I work in this field and so will provide some figures and insight, but only you can decide for yourself whether the risk of another OASI (obstetric anal sphincter injury, i.e. 3rd or 4th degree tear) is outweighed by the benefits of another vaginal delivery instead of a C section. It also depends on how many children you plan on having. It’s fantastic that you’ve not had any issues and healed up well!
As a starting point - The chances of having an OASI is about 6-7%, or 1 in 16 to think of it another way. Older literature gives lower figures which are likely to be inaccurate, as now OASI is better diagnosed as a lot of trusts now actively look much more closely for it and have an “OASI care bundle” in place for every patient to mitigate the risks of OASI and the risks of complications if you do have one.
Midwives etc will tell you that if you tore badly with your first then you probably won’t tear as much with your second. This is sort of true but I think it also obscured the truth. IF you have an OASI with your first vaginal delivery then you are MORE likely to tear severely with your second child than anyone is likely to tear severely with their first. i.e. If you had a severe tear with your first then the risk of a severe tear with you second goes up to about 1 in 10. Yes that means that 9 times out of 10 someone in your position wouldn’t tear, but that’s a risk/benefit only you can weigh up. The bad news about tearing severely a second time is that the outcome (ie pain, incontinence of flatus/urine/faeces) are all likely to be worse the second time. If you have been doing your pelvic floor exercises every day for the last 7 years then this is less likely in the short term. Sadly these issues often don’t come to light (or get significantly worse) until the menopause.
The other option is a delivery in hospital or a C section. The recovery from a planned CS is very very different from an emergency CS, and generally much wiser. Unfortunately the figures are often mixed together… If you deliver in a labour ward then the obstetrician can shine a bright light on all your bits afterward, carefully assess whether any fibres of the anal sphincter are showing (to indicate another OASI) and then carefully oppose them to suture them together for hopefully another good cosmetic and functional outcome.
I hope that some of this helps you to come to a decision that’s right for you. I think that the antenatal consent process for vaginal deliveries is appalling and often minimises the discussion around women’s well founded fears or worries. You will make the right decision for you and your body is powerful and amazing!