Vagina pH I guess?

Savannah
Hey guys. So I have been on the pill since I was about 10 (bled for like a month and a half not fun) and so I've been on the same pill for a decade now. The last couple periods have been weird. 3 ago I didn't have one, 2 ago it was normalish and this last one I spotted for like a day, went 3 days no blood then bled heavy for a day. I use a manual wheelchair so I get that my flow is statistically abnormal anyway, but since I've been having weird periods it's like I've started to smell weird. I'm very sanitary and I don't know what to do. 
Thanks!