The supposed magical figure is 120 / 80.
110 / 74, isn't too bad, you'd have a problem if was around 90/60.
It might possibly be linked to Salt intake. Too much Salt can cause Hypertension, but there may be a correlation with too little Salt, as that could cause an electrolyte imbalance, but whether too little impacts on blood pressure negatively, I'm not 100% certain.
If the reading was a bit too low it could be tied in with some kind of mild Heart issue, like a slight inability to pump blood out of the heart.
There is a situation called Water Hammer or Trip Hammer pulse, where the blood "regurgitates" and goes back through a valve, as the pulse requred to pump effectively is weak and doesn't provide the requisite force to push the blood effectively.
Magnesium is prevelant in quite a few things like Beans, Rice and Fish as examples. Halibut has the best source of dietary Magnesium.
In relation to menstruating, Iron is something females menstruate, so whereas men and females over 50 generally need around 7-8mg a day, menstrual females need around 14-15mg a day.
Iron intake can be helped by Vitamin C and Capsicum as they act as boosters, but too much Caffeine and Tannic Acid and alos too much Magnesium and Calcium and Copper can block Iron, by causing some kind of interference.
Heme Iron in animal matter is best absorbed at around 15-20%, as it helps to form Red Blood Cells, (Erythrocytes), that carry oxygen around the blood.
Heme helps to make the Heamoglobin in Erythrocytes and Myoglobin, that stores Oxygen in muscles red.
Non-heme in plant matter is absorved at around 5-10%, but grains are the best for plant matter, so the issue might be iron related as you don't eat grains and red meat, two of the best source of dietary Iron.
One thing you could try is taking a Vitamin C supplement. Take a 500mg one in the morning and if there's any issue try buffered. You could then have another at night, this could potentially then be stepped up to 2 x 1g a day.
if you're eating 5 times a day, consider a 6th meal around 2 hours after dinner.
You could easily increase your intake of Iron and B Vits, by having something like a small portion of Chicken and Beans, as Beans are good for B Vits, so a pre-cooked Chicken Breast and a small portion of cooked beans would work, as would some Mushroom, or indeed a small portion of Rice.
You can get things like Microwavable rice that contains things like a few peas and other stuff, which might be worth looking into, if you're fine digesting Rice.
Chicken is also good for Zinc which boosts the immune system, so the added Zinc and C would be beneficial.
So there are things to think about there which you should do some research on first for your own piece of mind.