An estimate of being roughly seven times more likely to die is a reasonable summary of the information in the paper you linked yourself. The sentence in the abstract is
Pregnant women with SARS-CoV-2 infection—as compared with uninfected pregnant women—were at significantly increased risk of maternal mortality (10 studies; n=1490; RR 7.68, 95% CI 1.70 to 34.61)
The RR 7.68 means that the relative risk is 7.68 higher for pregnant women with a SARS-CoV-2 infection compared to pregnant women without infection. The studies contained a total of n=1490 pregnant women (I'm not sure whether this is the number of women with infection or the total). The last bit means a 95% CI convidence interval for the estimated relative risk is somewhere between 1.70 and 34.61. Hence there is fairly high convidence that the risk is increased but by how much the risk is increased is very uncertain.
Another useful number for context is the general maternal mortality during child birth which in the US is around 20 per 100.000 birth (source). This number of deaths is estimated to be increased by a factor of around 7 due to a SARS-CoV-2 infection.
Edit: JonathanReez claims that the answer should be inconclusive so a here a few more words on what the study claims (and is correct in claiming) and what it doesn't.
First one can compute backwards that with a base rate of maternal mortality of around 20 per 100.000 and an RR of 7.68 comes out to exactly two deaths in their sample of n=1490 (equivalent to an observed maternal mortality of around 150 per 100.000 in the sample).
This turns this into a classical probability problem. The null hypothesis is that there is no effect due to corona. So how likely is it to observe 2 deaths in 1490 women if the maternal death rate is 20 per 100.000? It turns out this probability is smaller than 5% (but bigger than 1%). Hence one can conclude with 95% confidence that women with a corona infection suffer a higher maternal mortality than women without (which is what the study says). We couldn't make the same conclusion with 99% confidence.
Trying to estimate how much bigger the maternal mortality rate actually is is very difficult due to the limited data. The 2 observed deaths lead to an estimate of 7.68 higher than normal but whether the actual increase is more around twice as big or more around 30 times as big cannot be concluded from the data (the study computes this as a 95% confidence that the effect is in the interval [1.70, 34.61]).
Additionally the claim is only saying that women with a corona infection have higher maternal mortality. It does not claim that the higher mortality is due to the corona infection. This could be the case but it could also be the case that there is a confounding factor that increases both the risk of a corona infection and maternal mortality (for example race or poverty). This question cannot easily be answered with the limited amount of data and the study doesn't make any claims in this direction.