Positive HPT then period

Hannah
I'm looking for advice. I have a 15 month old son who was conceived in the first month of trying, despite having benign tumours in both my ovaries. In March we started TTC number 2 and fell pregnant again straight away. I miscarried at 7 weeks in May. Didn't try in June. Fell pregnant in July (late period and positive HPT) then had a period so it was a chemical pregnancy. The same has happened again this month (late period, positive HPT). What would you do now? I seem to conceive very easily but now can keep the pregnancy going. Advice please...